This guy sounds like he had the same problem but he was running his virus scanner:
My virus scanner is stopping mid scan. It appears it is stopping at a file
> in the following folder ...C:\Documents and Settings\RWC\Local
> Settings\Temp\Temporary Internet Files . I attempted to delete my all
these
> Temporary Internet Files, but I get the following error message: "Cannot
> Delete TOD876~1.HTM . Make sure you specify the correct path and file
name."
> A search for a file by that name produces no result.
>
> In addition to the above, when the virus scan halts, a new file is placed
on
> my desktop. It is MXUIShell.mxe .
>
> This started when my virus program indicated that an email with a virus
had
> arrived and I instructed the virus program to "repair" the problem.
>
> Because I wasn't able to run the virus scan from the program in my
computer,
> I ran the full internet scan offered by Trend Anti-Virus, and it came out
> clean.
>
> I also attempted to run System Restore to a time earlier today. That did
not
> fix the problem.
>
> Can anybody help me or does this mean a complete reformat of my hard
drive?
>
>