So you practically need to go for the 2 T now ?!
Try that too ,until your new ram gets installed.
Anyways you should do a repair of W7 from within the disc ,sfc scannow may not do to much.
Also run a check disc on the windows partition.
Many BSOD-s can lead to file system corruption.
I would do a clean install or a back-up restore after replacing RAM.
If the new ram doesn t fix the issue RMA the CPU , it may have a bad IMC ,as it already has a core locked ,maybe a bad chip.
Edit: Oh, it s Vista
You should get rid of that too