Memory Management

Hi,
When I bought my PC, the person who made it allocated 2GB of my 8GB of RAM to my GPU. Today, I've got a new GTX670, this has its own 4GB of GDDR5 RAM. Now, I get a 'Memory management error. I've tried running some command lines in the boot CMD (I get BSOD after 10s) with no luck. I believe it was called src /SCANNOW. This did nothing. I've tried running the memory diagnosis, nothing. It doesn't crash in safe mode.
Please help- how can I re-allocate the RAM to system shared?

A setting of that nature can only be made from within the BIOS I would expect. Boot to the BIOS using F2 or Del normally and reset to defaults as will clear the shared mamory to the GPU. To reset its normally F9 then go to Yes. To save is normally F10 and again go to Yes.