Welcome to GTG.
I suggest giving us a HijackThis log also. But before you do that, read the link below in my signature (Read this before posting your HijackThis log..). Once that's done, do the below:
Please print out or copy this page to Notepad. Make sure to work through the fixes in the exact order it is mentioned below. If there's anything that you don't understand, ask your question(s) before proceeding with the fixes. You should not have any open browsers when you are following the procedures below.
Go to Start->Run and type in regedit and hit OK. Go to File->Export and save the registry somewhere as a backup. While in the Registry Editor, navigate to:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ and delete MdeRy
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\Root\ and delete LEGACY_MDERY
HKEY_CURRENT_USER\Software\Microsoft\ and delete PCHealth
If any of the above registry keys are giving you problems deleting, right click on them and click on Permissions. Then click on the Advanced button. Make sure the first box (Inherit from parent...) is checked. Click OK and OK. Then try deleting the entry again. Once you're done, close the Registry Editor.
If you have a fast internet connection (broadband), run an online virus scan at TrendMicro
http://uk.trendmicro...call_launch.php. Just follow the instructions on the site to run the online scan. If any viruses/trojans are detected, try to delete or clean them in that site. You may use Panda ActiveScan also at
http://www.pandasoft...ucts/activescan. Otherwise, make sure your antivirus program has the latest definitions and run a full system scan.
Restart and now run HijackThis. Save the log and post it here.