Thanks for that eyeC. Definately showing memory corruption in all of these, looks like you have a faulty stick of RAM or two!
To be absolutely certain, download memtest, which will check your memory for errors (
Memtest86 - Download Page)
If you have a floppy drive and a spare floppy disk (easiest method) download:
http://www.memtest86.com/memtest33.zip - extract and run
install.bat
If you have a cd-writer, a spare cd and Nero installed, download:
http://www.memtest86.com/memtest86-3.3.iso.zip and burn the image
memtest.iso.
Reboot the PC and start your PC with the floppy/cd inserted and let memtest do it's work. Any errors along the way will be highlighted in red.
Once you have confirmed that you have faulty memory, it will be time to look for new, they are easy enough to replace, so I will talk you through it if you need to.