You need to do a full virus and spyware removal with a system tune up.
Follow these instructions if you want your PC to perform properly.
Start your computer in Safe Mode. To do this, turn on your PC, after the boot screen loads, start tapping F8 until a screen appears giving you Startup Options. Choose "Safe Mode." You may be asked to choose an Operating System as well, if there is more than One OS available, choose Windows XP.
When your PC boots into Windows, log in as the Administrator. A box will appear, click Yes to enter the OS in Safe Mode. Click on the Start button, go to Run, type in "msconfig" (without the quotation marks) and hit enter.
A box will appear, click on the "Startup" tab and un-check everything. Click on Apply, then Click on Ok, then Restart your PC.
When your PC restarts it will load the software that it needs to operate properly such as the Video Drivers, Audio Drivers, Ethernet Drivers, etc., but nothing else.
If you are using a Wireless Internet Connection, do not un-check the Wireless Internet Program or your WiFi will not work.
Now you need to download and install some free software and run a lot of scans to fully clean your PC.
Go here http://www.SpywareTerminator.com and download Spyware Terminator.
I have been using this program on every computer I have worked on in the last 2 years and it works every time.
During setup, you will be asked if you want to integrate CLAM Anti Virus into Spyware Terminator, say Yes. You will also be asked if you want to install the Crawler Toolbar, say Yes. The Crawler Toolbar is a filter for your Internet Explorer or FireFox browser and will alert you if you come across a website that is potentially dangerous.
Next, go to http://www.softpedia.com/progDownload/Ad… and download Advanced System Care. It is another free program that works very well.
One more thing, go to http://www.wisecleaner.com/download.html and download the Wise Registry Cleaner Free Edition as well as the Wise Disk Cleaner Free Edition.
Run the Spyware Terminator program first and make sure that you run a Full Virus and Spyware Removal scan so the program picks up everything and not just the Spyware files.
Run the Wise Disk Clean Up program.
Run the Wise Registry Cleaner.
After you are done cleaning the Registry, use the Wise Registry Cleaner to Defragment the Registry. After Registry Defragmentation is complete, restart your PC.
When your PC restarts, go to the Start Menu, go to Program, go to Accessories, go to System Tools, go to Disk Clean Up, choose the C: Drive, make sure that the "Compress Old Files" check-box is checked and the "Recycle Bin" is checked.
After Disk Clean Up is done, go back to the System Tools area in the Start Menu and click on Disk Defragmentation. Choose the C: Drive and click on "Defragment."
This is going to take a while, but when you are done, your PC will run almost as good as new and it will have all the software you need to keep it clean for as long as you own it.