How come my computer freezes on the welcome screen then works fine when I reboot?

by on May 30, 2013

Q: when i turn on pc it freezes on the welcome screen i restart it and it works fine,after couple of hours it starts tu run so slow it takes a minute for google to open ,then from that page i can open anything and it opens fast…no virus,a lot of free space on hd,good configuration i dont know whats the problem.any solutions?