Try these items in order of appearance.
Go to
http://housecall.trendmicro.com or
http://www.pandasoftware.com/activescan/com/activescan_principal.htm and click the Scan Now link to run a free on-line virus scan.
***
Get, install, update and run free Ad-aware (and its HexDump plug-in) from
http://www.lavasoftusa.com/software/adaware/
First in the main window look in the bottom right corner and click on Check for updates now and download the latest referencefiles.
Make sure the following settings are made and on -------ON=GREEN
From main window :Click Start then Activate in-depth scan (recommended)
Click Use Custom Scanning Options' then click Customize' and have these options selected: Under Drives and Folders put a check by Scan Within Archives and below that under Memory and Registry put a check by all the options there.
Now click on the Tweak button in that same window. Under Scanning engine select: Unload recognized processes during scanning and under Cleaning Engine select: Let windows remove files in use at next reboot
Click proceed to save your settings.
Now to scan just click the Next button.
When the scan is finished mark everything for removal and get rid of it.(Right-click the window and choose select all from the drop down menu and click Next)
Restart your computer.
***
Internet Explorer 5.x/6.x comes with a repair tool. To use it, go to the Add/Remove Programs Control Panel; Scroll and click to highlight 'Microsoft Internet Explorer 5/6.x' in the Install/Uninstall window; Then click on the Add/Remove button; Select 'Repair' the current installation of Internet Explorer radio button; Click on OK. Restart your computer when prompted.
***
Open Internet Explorer (IE); Tools menu; Internet Options; Advanced tab; Click the Restore Defaults button; Click Apply; Click Ok. Close IE.
Open (IE); Click the Tools menu; Point to Internet Options; Click the Security tab; Click the Default Level button; Click Apply; Click Ok. Close IE.
Open IE; Click the Tools menu; Internet Options; Click the Security tab; Click the Custom Level button; Click Apply; Click Ok. Close IE. Start IE as desired.
***
You need to be running a firewall like free Sygate from
http://download.com - type, sygate, in the Search box, you must be on-line to register Sygate, that is if you're not using a firewalled Router on a Network or, have another third-party firewall like Sygate installed, to protect you and the Internet community from hackers, spammers and terrorist from using your computer for their own illicit needs while you're on-line?
***
What anti-virus are you using? If you're running Mcaffee or Norton anti-virus and have not recently paid for a one year subscription to download weekly new virus definitions, you might consider getting free AntiVir 6 from
http://free-av.com - Uninstalling Mcaffee; Restarting your computer and installing free AntiVir Anti-virus 6.0.