my computer xp freezes all of a sudden when i have use it.i checked everything ,hard disks,registry.everything is clean.Blue screens also come up some times.Any one got a solution plz help asap.

I came aware of the site as i got messages in my inbox of micro 2000 which i really  enjoyed to read.So i gave a shot at the forum and here i am.
My computer is very old about 5 yhrs old.its an xp home edition pcw1 series pentium 4, very good lookin with an attached keyboard and cpu to the monitor.
I use reg cure because i thought registry is the problem that causes bluescreens and constant freezing but it still freezes anyway.
Then i gave a ram a shot by changing it coz the old one by noticing even froze the computer more frequently.So i consulted crutial and i got a compartible ram sent through my post.I know how to install the ram so i did.took out the old one and inserted new one.The computer worked fine but after about 8 hrs,the freezing poped up again.hard disk test is fine.dont know how to do video card test though.No error messeges apart from blue screens.If i played too many videos over time,the computer will freez or bsod.If i open up to many web pages the same thing happens.My computer has also got 2 ram slots.i put two new rams all compartible.I noticed a speed change but the freezing didnt give up,its still haunting my computer.Thats as much detail as i can give which could be hard to read.And there is my story.I will be happy if u helped.

Well,i didnt use any special software apart from going into m computer,chose the drive to test e.g drive c or d.then properties,tools and chech for errors.Thats what i did.I dont know if its the best way tho

U know when i try to download the Hd test tool from seaTool,its says Msi launch failed.installation aborted so i cant install the tool.plz help