HI,
Scan for Malware in Safe Mode with Networking.
How to start Windows in Safe Mode
Windows Vista
Using the F8 Method:
Restart your computer.
When the computer starts you will see your computer's hardware being listed. When you see this information start to gently tap the F8 key repeatedly until you are presented with the Windows Vista Advanced Boot Options.
Select the Safe Mode with Networking option using the arrow keys.
Then press the enter key on your keyboard to boot into Vista Safe Mode.
When Windows starts you will be at a typical logon screen. Logon to your computer and Vista will enter Safe mode.
Do whatever tasks you require, and when you are done, reboot to go back into normal mode.
Once in Safe Mode with Networking, download and run RKill.
RKill does NOT remove Malware; it stops the Malware Process giving you a chance to remove it with your Security Programs.
RKill Download
Then, download, install, update and scan your System with the free version of Malwarebytes AntiMalware in Safe Mode with Networking:
Malwarebytes : Malwarebytes Anti-Malware removes malware including viruses, spyware, worms and trojans, plus it protects your computer
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If you are using Norton, AVG, Avira, Microsoft Security Essentials, McAfee, etc the default action is for Windows Defender to be disabled, as those AntiVirus Programs have their own Antispyware Applications.
It is nothing to be worried about.
Using the two Programs at the same time can cause System conflicts, etc.
Cheers.