he Stop 0x7A message indicates that a page of kernel data was not found in the paging (virtual memory) file and could not be read into memory. This might be due to incompatible or defective disk drivers, firmware, or hardware, bad sector in a paging file, a virus, or failing RAM.
1) Completely remove your page file (set it manually to zero), reboot then change your pagefile back to what it was before. Reboot.
(System properties > advanced > performance > advanced)
2) Run memtest86 to rule out bad ram.
(google memtest86 and download for the site, follow instructions)
3) if you havent run chkdsk /r then do so.
4) Replace your Hdd drivers, if you have an Nforce board then remove your nforce drivers and install the latest versions.