Some Win7 updates won't install. Can't install SP1 or Win 7 Upgrade

Sometimes an update is dependent on prior updates. Might try downloading/installing that update again as the first download may have been corrupted.

We've tried installing that update (the oldest one in his listing of unsuccessful installs) numerous times. No go. Thanks.

1. Is your client in the habit of running "Registry cleaners?" (e.g., Registry Mechanic; System Mechanic; RegCure; RegClean Pro; Advanced SystemCare; AVG PC TuneUp; Norton Registry Cleaner; PCTools Optimiser; SpeedUpMyPC; CCleaner Registry Cleaner)

2.System Restore.
Is there a System Restore point created PRIOR to when the problems started?

3. Clear out the temporary downloads file and internet cache to remove any corruption from there.

To delete temporary update files

Open Computer by clicking the Start button Picture of the Start button, and then clicking Computer.

Double-click the local hard disk where Windows is installed, typically drive C.

Double-click the Windows folder, and then double-click the SoftwareDistribution folder.

Double-click the DataStore folder to open it, and then delete all files and folders in the folder.
Administrator permission required
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

Click the Back button. In the SoftwareDistribution folder, double-click the Download folder to open it, and then delete all files in the folder.

Administrator permission required.
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

4. Have you checked in Event Viewer for relevant messages pertaining to the problems experienced?

5.
You can also contact the support for free about update/SP1 issues:

Get Help Now

Contact a support professional by E-mail, Online, or Phone

I meant downloading it all over again, not just retrying the install.

I've passed the info to the customer. It maybe a few days before he has the time to try the suggestions. In answer to your questions (JMH): I don't know if the customer has used any registry cleaners. I'll find out. 2) I'm unsure as to whether he tried a system restore. 3) I've asked him to try cleaning out the temporary downloads. 4) I checked the Event Viewer but couldn't find any info beyond "unsuccessful installation" of the updates. 5) The customer was in contact with Microsoft and they provided 3 days full of suggestions and but couldn't find a solution.

Thanks to everyone for their input.

sibbil said:

I meant downloading it all over again, not just retrying the install.

To help in this regard: Download: Security Update for Windows 7 (KB2207566) - Microsoft Download Center - Download Details

Possibly, update KB2207566 could be culprit (from way back in August 2010). Is there any way to get a complete listing of files that were installed/updated? I checked the knowledgebase but couldn't make head or tail of it. SCHANNEL.DLL is a major player in this update but I don't know what other files were affected. Thx.

There is a link provided in the link I gave to the KB article listing all .dll files, .mum, and .manifest changes. MS10-085: Vulnerabilities in SChannel could allow denial of service

Yeah, I read through that but for the life of me I couldn't decypher the info to find a usable file listing.