If you have Window Vista Home Premium and ever tried installing SP1 via Windows Update, chances are you might have got stuck with the installation with your system going through a reverting process. Even if you tried booting via safe mode, via CD boot disk or some other method, you could not bypass the ‘revert’ stage.

So what are your choices, given that you failed to stop this never-ending cycle. Well, you can at least do a reading here as your last resort.

If when you try to install Vista SP1, you get one the following error message/s:

Service Pack did not install. Reverting changes
Installation was not successful
An internal error occurred while installing the service pack

Here are a few steps you may try:

Check and Ensure that your Windows Modules Installer Service (trustedinstaller.exe) is not disabled and stopped; but set to manual and started. This WMI Service enables installation, modification, and removal of WindowsUpdates.

Restart your computer and check Windows Update again.

Ensure that the following three updates are installed and do not show as failed: KB935509, KB938371, KB937287.

Check your hard disk for errors. Please also see this Checklist.

Disable your anti virus, firewall, anti-spyware and restart. Make sure these 3 are disabled on restart.

Run the System File Checker Tool. Open cmd and type sfc /scannowand then press ENTER.

Run the Windows Vista Memory Diagnostic Tool. Open Memory Diagnostics Tool. Click Restart Now and Check Problems. Your computer will restart and the diagnostic program will start. Note any reported errors. For more help, click KB947366.

If you get any one of these errors while trying to install Vista SP1, you might want to see Troubleshooting Windows Updates Page.

0×80070002 ERROR_FILE_NOT_FOUND
0x8007000D ERROR_INVALID_DATA
0x800F081F CBS_E_SOURCE_MISSING
0×80073712 ERROR_SXS_COMPONENT_STORE_CORRUPT
0x800736CC ERROR_SXS_FILE_HASH_MISMATCH
0x800705B9 ERROR_XML_PARSE_ERROR
0×80070246 ERROR_ILLEGAL_CHARACTER
0x8007370D ERROR_SXS_IDENTITY_PARSE_ERROR
0x8007370B ERROR_SXS_INVALID_IDENTITY_ATTRIBUTE_NAME
0x8007370A ERROR_SXS_INVALID_IDENTITY_ATTRIBUTE_VALUE
0×80070057 ERROR_INVALID_PARAMETER
0x800B0100 TRUST_E_NOSIGNATURE
0×80092003 CRYPT_E_FILE_ERROR
0x800B0101 CERT_E_EXPIRED
0x8007371B ERROR_SXS_TRANSACTION_CLOSURE_INCOMPLETE

You can also get Free Microsoft Support regarding Vista SP1 installation problems. Microsoft is providing ‘No Charge’ support for Windows Vista Service Pack 1. This also includes Email, Chat and Phone support. If you are facing any problem while installing SP1, or after its installation, you can seek help at this Microsoft Vista SP1 Help Site. Unlimited installation and compatibility support, on Windows Vista Service Pack 1 (All Languages) is available at no charge until March 18, 2009.