Did you try going into the Control panel and resetting the mouse pointer? (Click Start/Control panel/Mouse) Make sure the PS2 plug is firmly inserted into the back of the case, perhaps the drop dislodged it enough to cause the problem.

cheryl if you want to try to make sure you are totally clean I can have you go to one of the pro security forums and we can help you there with some other special programs. We have had really good luck getting this wiped out. Recently this infection has added components including rootkits and you may have one of the latest versions. HijackThis Logs go there and start a new thread asking for help with the antivirus xp infection, tell Corrine I sent you. The team there work together to get you cleaned up.

if it put it in quarantine you should be ok, most antivirus programs allow you to go to the chest and from there select delete. I would also run these 2 free programs to make sure you do not have anything else. SUPERAntiSpyware Malwarebytes' Anti-Malware download Malwarebytes' Anti-Malware to your desktop. * Double-click mbam-setup.exe and follow the prompts to install the program. * At the end, be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish. * If an update is found, it will download and install the latest version. * Once the program has loaded, select Perform full scan, then click Scan. * When the scan is complete, click OK, then Show Results to view the results. * Be sure that everything is checked, and click Remove Selected. Install them, update them then do the scans and let them clean up what they find. Also I would go and run this online scan too. FREE Online Virus Scan

Just keep right on using the computer is my suggestion. You need to have something besides your anti virus program unless it is a 'cure all' type program covering virii and malware. Something like the free Malwarebytes will do you proud. Be very sure to watch as you install to stay with the free version - unless you would like the pro version of course. After April just pay a little more attention to running a virus scan and a malware scan periodically and you'll do fine. The browser you use has nothing to do with XP. Your XP is the operating system.