Could you please boot to safe mode with networking and see if the problem occurs there? I'm guessing it won't, but let's see.
Also, here are some VERY BASIC troubleshooting steps you can take:
1) To check the ram, download memtest (http://www.memtest.org/
). Burn it to a cd using a dedicated .iso burning utility (http://www.petri.co.il/how_to_write_iso_files_to_cd.htm
), make sure the cd drive is at the top of the boot order in bios, then boot to the newly created cd and run the utility.
2) Right-click on a command prompt icon and open as administrator. In the command prompt window type:chkdsk /r
(then press ENTER). You'll be told the disk is in use and asked if you want to run checkdisk on the next boot. Say yes, exit the command prompt window, and reboot
3) Check for a bios update. Make sure you have the latest drivers for all hardware (get them from the OEM websites, not from Windows Update). Do not use beta drivers.