sqlserver2008r2安装问题，求解答

sqlserver2008r2实例 安装 失败，卸载好几次了，别的功能能 安装 成功，就是实例失败，Summary.txt如下: Overall summary: Final result: SQL Server 安装 失败。若要继续操作，请调查失败原因，更正 问题 ，卸载 SQL Server，然后重新运行 SQL Server 安装

sqlserver2008r2实例安装失败，卸载好几次了，别的功能能安装成功，就是实例失败，Summary.txt如下:

Overall summary:
Final result: SQL Server 安装失败。若要继续操作，请调查失败原因，更正问题，卸载 SQL Server，然后重新运行 SQL Server 安装程序。
Exit code (Decimal): -2068052377
Exit facility code: 1212
Exit error code: 1639
Exit message: SQL Server 安装失败。若要继续操作，请调查失败原因，更正问题，卸载 SQL Server，然后重新运行 SQL Server 安装程序。
Start time: 2014-06-30 09:10:12
End time: 2014-06-30 09:12:25
Requested action: Install
Log with failure: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\sql_engine_core_inst_Cpu32_1.log
Exception help link: http://go.microsoft.com/fwlink?LinkId=20476&ProdName=Microsoft+SQL+Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=10.50.1600.1

Machine Properties:
Machine name: LENOVO-PC
Machine processor count: 4
OS version: Windows 7
OS service pack: Service Pack 1
OS region: *
OS language: 中文(*)
OS architecture: x86
Process architecture: 32 位
OS clustered: 否

Product features discovered:
Product Instance Instance ID Feature Language Edition Version Clustered
Sql Server 2008 R2 管理工具 - 基本 2052 Enterprise Edition 10.50.1600.1 否
Sql Server 2008 R2 管理工具 - 完整 2052 Enterprise Edition 10.50.1600.1 否
Sql Server 2008 R2 客户端工具连接 2052 Enterprise Edition 10.50.1600.1 否
Sql Server 2008 R2 客户端工具向后兼容性 2052 Enterprise Edition 10.50.1600.1 否
Sql Server 2008 R2 客户端工具 SDK 2052 Enterprise Edition 10.50.1600.1 否
Sql Server 2008 R2 Integration Services 2052 Enterprise Edition 10.50.1600.1 否

Package properties:
Description: SQL Server Database Services 2008 R2
ProductName: SQL Server 2008 R2
Type: RTM
Version: 10
SPLevel: 0
Installation location: E:\aaaaaaaa\x86\setup\
Installation edition: ENTERPRISE

用户输入设置:
ACTION: Install
ADDCURRENTUSERASSQLADMIN: False
AGTSVCACCOUNT: NT AUTHORITY\NETWORK SERVICE
AGTSVCPASSWORD: *****
AGTSVCSTARTUPTYPE: Manual
ASBACKUPDIR: C:\Program Files\Microsoft SQL Server\MSAS10_50.MSSQLSERVER\OLAP\Backup
ASCOLLATION: Chinese_PRC_CI_AS
ASCONFIGDIR: C:\Program Files\Microsoft SQL Server\MSAS10_50.MSSQLSERVER\OLAP\Config
ASDATADIR: C:\Program Files\Microsoft SQL Server\MSAS10_50.MSSQLSERVER\OLAP\Data
ASDOMAINGROUP:
ASLOGDIR: C:\Program Files\Microsoft SQL Server\MSAS10_50.MSSQLSERVER\OLAP\Log
ASPROVIDERMSOLAP: 1
ASSVCACCOUNT: NT AUTHORITY\NETWORK SERVICE
ASSVCPASSWORD: *****
ASSVCSTARTUPTYPE: Automatic
ASSYSADMINACCOUNTS: lenovo-PC\lenovo
ASTEMPDIR: C:\Program Files\Microsoft SQL Server\MSAS10_50.MSSQLSERVER\OLAP\Temp
BROWSERSVCSTARTUPTYPE: Disabled
CONFIGURATIONFILE: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\ConfigurationFile.ini
CUSOURCE:
ENABLERANU: False
ENU: False
ERRORREPORTING: False
FARMACCOUNT:
FARMADMINPORT: 0
FARMPASSWORD: *****
FEATURES: SQLENGINE,REPLICATION,FULLTEXT,AS,RS
FILESTREAMLEVEL: 0
FILESTREAMSHARENAME:
FTSVCACCOUNT: NT AUTHORITY\LOCAL SERVICE
FTSVCPASSWORD: *****
HELP: False
IACCEPTSQLSERVERLICENSETERMS: False
INDICATEPROGRESS: False
INSTALLSHAREDDIR: C:\Program Files\Microsoft SQL Server\
INSTALLSHAREDWOWDIR: C:\Program Files\Microsoft SQL Server\
INSTALLSQLDATADIR:
INSTANCEDIR: C:\Program Files\Microsoft SQL Server\
INSTANCEID: MSSQLSERVER
INSTANCENAME: MSSQLSERVER
ISSVCACCOUNT: NT AUTHORITY\NetworkService
ISSVCPASSWORD: *****
ISSVCSTARTUPTYPE: Automatic
NPENABLED: 0
PASSPHRASE: *****
PCUSOURCE:
PID: *****
QUIET: False
QUIETSIMPLE: False
ROLE:
RSINSTALLMODE: DefaultNativeMode
RSSVCACCOUNT: NT AUTHORITY\NETWORK SERVICE
RSSVCPASSWORD: *****
RSSVCSTARTUPTYPE: Automatic
SAPWD: *****
SECURITYMODE:
SQLBACKUPDIR:
SQLCOLLATION: Chinese_PRC_CI_AS
SQLSVCACCOUNT: NT AUTHORITY\NETWORK SERVICE
SQLSVCPASSWORD: *****
SQLSVCSTARTUPTYPE: Automatic
SQLSYSADMINACCOUNTS: lenovo-PC\lenovo
SQLTEMPDBDIR:
SQLTEMPDBLOGDIR:
SQLUSERDBDIR:
SQLUSERDBLOGDIR:
SQMREPORTING: False
TCPENABLED: 1
UIMODE: Normal
X86: False

Configuration file: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\ConfigurationFile.ini

Detailed results:
Feature: 数据库引擎服务
Status: 失败: 请查看日志了解详细信息
MSI status: 失败: 请查看下面的详细信息
MSI error code: 0x1639
MSI log file location: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\sql_engine_core_inst_Cpu32_1.log
MSI error description:
Configuration status: 已通过

Feature: SQL Server 复制
Status: 失败: 请查看日志了解详细信息
MSI status: 失败: 请查看下面的详细信息
MSI error code: 0x1639
MSI log file location: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\sql_engine_core_inst_Cpu32_1.log
MSI error description:
Configuration status: 已通过

Feature: 全文搜索
Status: 失败: 请查看日志了解详细信息
MSI status: 失败: 请查看下面的详细信息
MSI error code: 0x1639
MSI log file location: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\sql_engine_core_inst_Cpu32_1.log
MSI error description:
Configuration status: 已通过

Feature: Analysis Services
Status: 失败: 请查看日志了解详细信息
MSI status: 失败: 请查看下面的详细信息
MSI error code: 0x1639
MSI log file location: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\sql_as_Cpu32_1.log
MSI error description:
MSI status: 失败: 请查看下面的详细信息
MSI error code: 0x1639
MSI log file location: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\sql_engine_core_inst_Cpu32_1.log
MSI error description:
Configuration status: 已通过

Feature: Reporting Services
Status: 失败: 请查看日志了解详细信息
MSI status: 失败: 请查看下面的详细信息
MSI error code: 0x1639
MSI log file location: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\sql_engine_core_inst_Cpu32_1.log
MSI error description:
Configuration status: 已通过

Rules with failures:

Global rules:

Scenario specific rules:

Rules report file: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Log\20140630_090925\SystemConfigurationCheck_Report.htm

sql_engine_core_inst_Cpu32_1.log如下:

=== Verbose logging started: 2014/6/30 9:12:19 Build type: SHIP UNICODE 5.00.7601.00 Calling process: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\SQLServer2008R2\x86\setup100.exe ===
MSI (c) (54:84) [09:12:19:033]: Resetting cached policy values
MSI (c) (54:84) [09:12:19:033]: Machine policy value 'Debug' is 0
MSI (c) (54:84) [09:12:19:033]: ******* RunEngine:
******* Product: E:\aaaaaaaa\x86\setup\sql_engine_core_inst_msi\sql_engine_core_inst.msi
******* Action:
******* CommandLine: **********
MSI (c) (54:84) [09:12:19:034]: Client-side and UI is none or basic: Running entire install on the server.
MSI (c) (54:84) [09:12:19:034]: Grabbed execution mutex.
MSI (c) (54:84) [09:12:19:036]: Cloaking enabled.
MSI (c) (54:84) [09:12:19:036]: Attempting to enable all disabled privileges before calling Install on Server
MSI (c) (54:84) [09:12:19:036]: Incrementing counter to disable shutdown. Counter after increment: 0
MSI (s) (C0:A8) [09:12:19:041]: Running installation inside multi-package transaction E:\aaaaaaaa\x86\setup\sql_engine_core_inst_msi\sql_engine_core_inst.msi
MSI (s) (C0:A8) [09:12:19:041]: Grabbed execution mutex.
MSI (s) (C0:70) [09:12:19:042]: Resetting cached policy values
MSI (s) (C0:70) [09:12:19:042]: Machine policy value 'Debug' is 0
MSI (s) (C0:70) [09:12:19:042]: ******* RunEngine:
******* Product: E:\aaaaaaaa\x86\setup\sql_engine_core_inst_msi\sql_engine_core_inst.msi
******* Action:
******* CommandLine: **********
MSI (s) (C0:70) [09:12:19:043]: Machine policy value 'TransformsSecure' is 0
MSI (s) (C0:70) [09:12:19:043]: User policy value 'TransformsAtSource' is 0
MSI (s) (C0:70) [09:12:19:043]: Machine policy value 'DisableUserInstalls' is 0
MSI (s) (C0:70) [09:12:19:043]: Specified instance {B5153233-9AEE-4CD4-9D2C-4FAAC870DBE2} via transform :InstID01.mst;:InstName01.mst is already installed. MSINEWINSTANCE requires a new instance that is not installed.
MSI (s) (C0:70) [09:12:19:044]: MainEngineThread is returning 1639
MSI (s) (C0:A8) [09:12:19:045]: User policy value 'DisableRollback' is 0
MSI (s) (C0:A8) [09:12:19:046]: Machine policy value 'DisableRollback' is 0
MSI (s) (C0:A8) [09:12:19:046]: Incrementing counter to disable shutdown. Counter after increment: 0
MSI (s) (C0:A8) [09:12:19:046]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\Rollback\Scripts 3: 2
MSI (s) (C0:A8) [09:12:19:046]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\Rollback\Scripts 3: 2
MSI (s) (C0:A8) [09:12:19:046]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\InProgress 3: 2
MSI (s) (C0:A8) [09:12:19:046]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\InProgress 3: 2
MSI (s) (C0:A8) [09:12:19:046]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (s) (C0:A8) [09:12:19:047]: Restoring environment variables
MSI (c) (54:84) [09:12:19:049]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied. Counter after decrement: -1
MSI (c) (54:84) [09:12:19:049]: MainEngineThread is returning 1639
=== Verbose logging stopped: 2014/6/30 9:12:19 ===

怎么办？？