Look in msconfig startups for anything usual. Googgle them. Download Revo unistaller
Take a look in device manager, see if there is anything wrong there. Red exes, yellow exclaimations marks.
Disable IE add-ons in the control panel.
Do a browser RESET
Run sfc /scannow at the elevationed commanded prompt.
Check Event Veiwer for errors in systems and applications.
Uninstall all none essential software. Run CCleaner "registry clean" a few times until it shows no more results.
Run CHKDSK, set it to repair mode. 2-3 Hrs
Run Repair Install in the recovery partition.
You could run a clean install to troubleshoot
OK, you asked so there are a few things you can try. You can also download OTL and post the log to the security forum. Am I infected? What do I do?
And if all else fails, system recovery But, that would only be a last resort. If your pressed for time, and don't have important files to lose. Then reformat, install security, update, install DEll updates, install third party software. I've hard bad experiences with Firefox, or Waterfox 64bit system.
Edited by Nephilim1955, 22 March 2012 - 01:54 AM.