Prova prima con un sfc /scannow da start>esegui con il CD di Windows nel lettore
Se no prova con questo,da Kellys-Korner...Windows Installer fix(dovrebbe ripararlo,si spera).Copia/incolla sul blocco note questo script e salvalo sul desktop come file .reg ed eseguilo:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer]
"DisableMSI"=dword:00000000
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSIServer]
"ImagePath"=-
"ImagePath"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,6d,\
00,73,00,69,00,65,00,78,00,65,00,63,00,2e,00,65,00,78,00,65,00,20,00,2f,00,\
56,00,00,00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Wmi]
"Description"="Provides systems management information to and from drivers."
"DisplayName"="Windows Management Instrumentation Driver Extensions"
"ErrorControl"=dword:00000001
"ImagePath"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,\
00,76,00,63,00,68,00,6f,00,73,00,74,00,2e,00,65,00,78,00,65,00,20,00,2d,00,\
6b,00,20,00,6e,00,65,00,74,00,73,00,76,00,63,00,73,00,00,00
"ObjectName"="LocalSystem"
"Start"=dword:00000003
"Type"=dword:00000020
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Wmi\Parameters]
"ServiceDll"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,\
00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\
61,00,64,00,76,00,61,00,70,00,69,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,00,\
00
"ServiceMain"="WdmWmiServiceMain"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Wmi\Security]
"Security"=hex:01,00,14,80,90,00,00,00,9c,00,00,00,14,00,00,00,30,00,00,00,02,\
00,1c,00,01,00,00,00,02,80,14,00,ff,01,0f,00,01,01,00,00,00,00,00,01,00,00,\
00,00,02,00,60,00,04,00,00,00,00,00,14,00,fd,01,02,00,01,01,00,00,00,00,00,\
05,12,00,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,\
20,02,00,00,00,00,14,00,8d,01,02,00,01,01,00,00,00,00,00,05,0b,00,00,00,00,\
00,18,00,fd,01,02,00,01,02,00,00,00,00,00,05,20,00,00,00,23,02,00,00,01,01,\
00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSIServer]
"Type"=dword:00000020
"Start"=dword:00000003
"ErrorControl"=dword:00000001
"ImagePath"=hex(2):43,00,3a,00,5c,00,57,00,49,00,4e,00,4e,00,54,00,5c,00,73,00,\
79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,6d,00,73,00,69,00,65,00,78,\
00,65,00,63,00,2e,00,65,00,78,00,65,00,20,00,2f,00,56,00,00,00
"DisplayName"="Windows Installer"
"DependOnService"=hex(7):52,00,70,00,63,00,53,00,73,00,00,00,00,00
"DependOnGroup"=hex(7):00,00
"ObjectName"="LocalSystem"
"Description"="Adds, modifies, and removes applications provided as a Windows Installer (*.msi) package. If this service is disabled, any services that explicitly depend on it will fail to start."
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSIServer\Security]
"Security"=hex:01,00,14,80,90,00,00,00,9c,00,00,00,14,00,00,00,30,00,00,00,02,\
00,1c,00,01,00,00,00,02,80,14,00,ff,01,0f,00,01,01,00,00,00,00,00,01,00,00,\
00,00,02,00,60,00,04,00,00,00,00,00,14,00,fd,01,02,00,01,01,00,00,00,00,00,\
05,12,00,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,\
20,02,00,00,00,00,14,00,8d,01,02,00,01,01,00,00,00,00,00,05,0b,00,00,00,00,\
00,18,00,fd,01,02,00,01,02,00,00,00,00,00,05,20,00,00,00,23,02,00,00,01,01,\
00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSIServer\Enum]
"0"="Root\\LEGACY_MSISERVER\\0000"
"Count"=dword:00000001
"NextInstance"=dword:00000001
Vedi poi come va...
Se no,non saprei cosa altro dire...