What are some good programs that speed up XP's preformance and stop lagging on most programs?

when i open certian programs ... XP laggs really bad ... i have tried registry cleaners ... my computer is virus free and spyware/malware free ... it just laggs ... the bigger the program ... the worse it laggs ... any advice would be much appreciated ... thanks

What are some good programs that speed up XP's preformance and stop lagging on most programs?virus scan

I know you may have already done it all but try doing it again as a complete procedure (I0ll skip virus scans in the process as you said you have no viruses)

1) Download CCleaner and perform a scan/cleaning

2) Download a registry cleaner (like Eusint Free Registry Cleaner) and perform a cleanup of registry

3) Perform a scan with AD Aware and another for Trojans

4) Remove all the files from

C:\documents and settings [Your name folder]/Local Settings/ Temp

and from

C:\documents and settings [Your name folder]/Local Settings/ Temporary internet files

and from

C:\documents and settings ALL USERS/Local Settings/ Temp

C:\documents and settings ALL USERS/Local Settings/ Temporary internet files

Then go to

C:\Windows\Temp and remove all the files

5) download a registry optimizer/defragmenting program and run it (Like Registry Mechanic)

6)Finally, perform a defrag and reboot.