Your PC is infected with malware, since Windows.exe is a known virus/worm and so
is Hidden Fax Window. If you have any anti-malware software installed on your PC,
make sure it is up to date and run full scans to see if it can remove these threats.
Also, get specialist help such as that available at
Spyware Beware. Read the instructions before posting there. Hope this helps.
Cheers. Spexx.