I suspect your machine may not be as clean as you think. What did you use to scan it? The Malicious software removal tool is not a full-fledged antimalware scan--it only scans for particular families of malware.
I would recommend restarting windows in safe mode with networking, and running the scan at
http://safety.live.com
http://support.microsoft.com/kb/315222
The above KB article shows how to restart in safe mode.
"Laura" <(E-Mail Removed)> wrote in message news:C19BCD55-CA9A-4485-A1B0-(E-Mail Removed)...
> DEP is automatically closing Windows applications. I have run malicious
> software scan, and no viruses were detected. Can't delete any programs
> because DEP closes any attempts. Can't run Windows Defender because DEP
> closes any attempts.
> Please help!
> Thanks