Ridiculous low FPS

Ever since the recent patches I've been experiencing FPS ranging only from 1-10 while prior to this I would stay at a stable 60 per game. My graphics card is a ATI Radeon HD 4650, which runs smoothly even on more graphically demanding games such as CODMW2, L4D2 or even TF2. Has anyone experienced similarly, or fixed a problem similar to this?

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