Just like the topic title says. I'm not sure if this is a known problem, or the reason for it (my guess is that its trying to delete c:\documents and settings\User\blahblah\Temp but has problems with the spaces. This cost me a lot of time and some files (managed to undelete the most important ones :)

I've never heard of Dial-a-fix causing this. Did you happen to get a log from Dial-a-fix?

Also, try these in your command prompt (Start, Run, cmd).

echo %TEMP%

echo %TMP%

Let us know what the results are.