Can you jump through a few hoops for me? Thanks, it'll help.
Right click on Computer, select Properties. Click Device Manager, then expand display adapter. What graphics card do you have? Right click on the video card to highlight it, select properties. Click the driver
tab and tell me what driver version you're running? Close out of the device manager when you're done.
Click the Windows logo and type, without quotes, "msconfig", then hit enter. Allow it through UAC and click the startup tab. List here everything that has a checkmark.
Has your fps always spiked, or is this recent? What other changes have you made to the machine? Was there any particular tweak guide you read? Something led you to try and enable more cores at boot.. do you still have the link to that page?