I have posted some simple checks that may help with your prob. The prob looks like it is related to the installation of dslextreme and will require them to help you overcome the conflict. Try these things first and see what happens.
Check Disk
1. Right click your disk drive icon (normally “C”),
2. Click “Properties.”
3. Click “Tools”
4. In “Error checking” click “Check Now”
5. Check the 2 boxes, “Automatically fix file system errors” and “Scan for and attempt recovery of bad sectors”
6. Click “Start”
7. At the pop-up window “The disk check could not……” Click “Yes”
8. Re-boot your PC and allow disk checker to start. (Do not press any key before it starts)
Verify Window’s Files
1. Go “START”, “RUN” type “CMD” Press “OK” or Boot PC into “safe mode with command prompt”
2. Type sfc /scannow /f (note:- space after sfc)
3. Windows file protection will check your files. Follow any prompts; you may be required to use your XP CD.
4. Re-boot your PC
System Restore
1. Go “Start”
2. “All programs”
3. “Accessories”
4. “System tools”
5. “System Restore”
6. Ensure “Restore to an earlier time” is checked and click “Next”
7. Select an earlier date when your PC worked well. (Must be a highlighted date)
8. Click “Next”
9. Allow system restore and reboot.
10. Check to see if problem still exists.
Clean Boot
1. Go “Start”
2. “Run”
3. Type “msconfig”
4. Click “OK”
5. Click “Services”
6. Check box “Hide all Microsoft services”
7. Click “Disable All”
8. Click “Apply”
9. Click “Restart”
10. System will reboot, Check if problem still exists. (Do not access the internet or open any file you are unsure of as you have no virus protector running.)
11. If problem is fixed, enable the disabled items 1 at a time until you find the one causing the problem. If not fixed, re-enable all and re-boot.
Check Malware
Go to http://www.besttechie.net/tools/mbam-setup.exe
and download and run Malwarebytes' Anti-Malware.
If you have not installed Service Pack 3 yet, do a Windows repair, if you have installed it, first try…..
Post a detailed report
Go to:- www.majorgeeks.com/download3155.html download and run Hijack this. “Do not try to do any repairs yourself.” Save the report and send it with your next post along with any error logs.
To check error logs, go to “START” “RUN” type “eventvwr.msc” Click “OK” and check if there any errors in the logs. Include any information that could help:-