Windows XP restarts

Hi, I got this PC that when I tried to turn it on after the bios post comes up. right before windows tries to load it restart, but occasionally it goes through, and windows successfully starts, but after a couple of minutes, like 5 minutes to an hour the PC just restart. I changed the Bios Batt, Changed the CD Rom, And CPU Fan. I still get the same problem. So I Now I Decided to change the settings on system failure to just throw me the Blue screen of death. right after I change the setting, like 30 seconds after my PC restarted again, it restarted it self for like 3 times then posted the Blue screen and I got This

http://i135.photobucket.com/albums/q146/rdr0314/PC%20HP/Firsterror.jpg

( if you guys cant see it the error code is :

Stop: 0x00000050 (0xF8940999, 0x00000001, 0x80717E16, 0x00000000) )

well after this happened, I turned the pc off, let it be for like 5 minutes, I restart again, the PC successfully boots all the way to the desktop, I dont touch it at all and I let it be for like 15 minutes, suddenly I get the Blue screen of death, and this time is little different an I get this....

http://i135.photobucket.com/albums/q146/rdr0314/PC%20HP/seconderror.jpg

Error code on this one is :

Stop: 0x0000000A (0x00000000, 0x00000002, 0x00000001, 0x804D7003)


I restarted the computer again and it goes through all the way to desktop, Took around 30 minutes, I connect a USB external HD and I get another BlueScreen, which is this one.

http://i135.photobucket.com/albums/q146/rdr0314/PC%20HP/seconderror.jpg


error code:

0x00000050 (0xF4410000, 0x00000000, 0xF83A4F77, 0x00000000)

Ntfs.sys - Address F83AF77 Base at F83A3000, DateStamp 48025be5

:confused So could Anyone help me fix this problem Plz.

PS. is my first time Posting in this forum, I dont know if I posted in the right place. Sorry in advance if I did post in the wrong place, I did look around but i was still unsure.

 

Hello and welcome to MajorGeeks!

Please try to avoid the use of ... in your posts as they get caught in the spam filter and no one can see the post until it is approved.

Your problem appears to be with your RAM. I would recommend downloading memtest86+ (here: http://www.memtest.org/) and burning it to CD. Then set your BIOS to boot from CD and run the CD for about 24h if possible. This should find and report any errors with your RAM which I believe is at fault at the moment.

If you do get errors immediately, there is no point running the test any longer, just take out all but one RAM stick and run the test again. If you still get errors, take out the one that is in there and put in another one. Keep doing this until you have found the faulty stick(s). If they are all faulty, you may have a bigger problem.