Please download HijackThis
http://www.greyknigh.../HijackThis.exe - this program will help us determine if there are any spyware/malware on your computer. Create a folder at C:\HJT and move HijackThis.exe there. Double click on the program to run it.
1. If it gives you an intro screen, just choose 'Do a system scan and save a logfile'.
2. If you don't get the intro screen, just hit Scan and then click on Save log.
3. Post the hijackthis.log file here. Do not fix anything in HijackThis since they may be harmless.
Since you can't run it, try saving this to a CD first. Then boot your computer into
Safe Mode with Networking. Run the HijackThis scan and save the log. Post it here.