I have read the 1st post & an also post #3

I had a similar problem on my Laptop Running XP with D2 running fine in Windows Mod but Laggy/Skippy in fullscreen.... That's what fixed mine

Ya, but the thing is, its doing this out of nowhere, not one thing has changed altered etc...just wtf, bout to just pack the computer up and put it in the closet, not buying a new one and this one is a pos....
Anyone else have any ideas though?...

Ran it in 2d. Fixed the problem.
Still weird it does this out of no where...

Maybe your Grafic card is over heating

Naw dont use one...but turned it down to 2d and it works now...which is weird cause it did it for no reason....

What do you mean you dont use one?

As in its on board gfx, like built in the motherboard, dont really consider that a gfx card.

Ah alright .. well anyway maybe something happend to the card there you need to check it.
Most people who get fps drops figure's that thier gfx card is over heating.