It appears that you've picked up some sort of virus, I can't tell which but you can still try to remove it.
First things first, unplug the computer from the network.
Next, reboot the computer into safemode.
You can get into safe mode by press "F8" just as windows start to load.
Once you are in safe mode, click Start -> Run and type: msconfig
click "OK"
From this window, select the tab labeled startup, and uncheck all the items listed there.
Next, you'll want to disable System Restore. You can do this at the system properties applet from the control panel.
Reboot your computer and scan your system for viruses.
If your scan is clean, then i'd recommend reconnecting the network cable and downloading a free antivirus like the one available at
http://free.grisoft.com and rescanning your system. You can also visit
http://housecall.trendmicro.com to scan your system if you don't want to install a different antivirus.
You may also want to scan your PC with
Spybot to remove any malware/spyware that may also be on your computer.
