It find out what services you can disable safely goto
http://www.blackviper.com/WinXP/service411.htm#Cryptographic_Services
how to get to service manager in windows XP home and PRO goto :
START—-> RUN and type services.msc this will bring up service manager use the website to configure it safely, if unsure please ask someone .
this process can speed up your computer a great deal
AGAIN PLEASE BE CAREFUL WITH THIS