this is depend .. first there is an MSCONFIG.exe tool use it from start and then click on run . type Msconfig a window will appear.. goto startup and uncheclk all unwanted program that start with windows .. like Ypager MSN ,,, in other mean remove alllllllllllllllllllllllllllllllllllll and keep the firewall and the antivirus .. If you offer me the name of the antivirus and the firewall you have I may be able to tell you what is the name of the start uyp file they use or simply tell me the program that start up to tell you what to uncheck this is step one Step 2 There is alot of services that start when your computer startup .. some of them are totally unneeded ..for me I dont use wireless connection. but in windows XP this services is automaticlly started .. so disable it this is a good gauid to tell you what is services can be disable http://techrepublic.com.com/5138-10877-574...l.e099.dl110305 Viruses can also couse your computer to slow Keep in mand there is a hotfix from MS I am sure that is you have upgrad your windows XP to SP2 .. there maybe a problem with the upgrad .. MS has release a hotfix for this .. some user has do this update and there PC run really slow Hopfully these info can help