Windows Update broke MMC (ATI driver?)

I fired up 7 today to be met with no sound. So I tried going into device mangaer. It wouldn't open and gave me a 'failed to create a temporary' something or other. It was a MMC error which goes back to at least Win2K.

I couldn't close several windows, access device mangaer etc, so not being in the mood to try and fix it, I opted for a restore point. I noticed that the most recent restoe point had a Windows Update Installed beside it (I had forgotten to turn off automatic updating )

I selected the next restore point where I knew everything was working and everytings back to normal.

I checked the Updates available and there was one for my Dell Monitor and one for an ATI pre-release driver. I just installed the Dell update and it seems fine. I'm not going to try the ATi driver as i prefer to get drivers from the source and not WU.

Anyone else (especially with ATI cards) have any WU troubles?

Well the system restore fixed the problem and I'm only assuming it was the ATI driver, although I can't say for sure at this stage.

The only other things i can think of is that :

A) I installed Adobe Acrobat Reader 9 (which should not have made any difference)

B) I edited the user32.dll.mui to have customised text, but oddly enough it simply removed the watermark entirely

C) I have an LCD projector temporarily attached as a 2nd monitor and I hadn't booted 7 with it attached before.

But none of those things should really have any impact on MMC AFAIK

Unless it happens again, I'm just going to let it slide