What kind of processor can i upgrade to with my current motherboard and processor?

There's thirteen motherboards in the MS-7641 series: http://www.msi.com/product/motherboard/#?search_allmodel=MS-7641

MS-7641 Series
880GMS-E41 (FX)
880GMS-E41
880GMS-E35 (FX)
880GMS-E35
880GMA-E41
880GMA-E35 (FX)
880GMA-E35
880GM-E35
760GMA-P34 (FX)
760GM-P34 (FX)
760GM-P23 (FX)
760GM-P21 (FX)
860GM-P43 (FX)

If you look at the motherboard image of each you'll see MS-7641 silk-screened right on the motherboard.
 
Solution

Lag

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May 30, 2010
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That it why I suggested CPU-Z, so we don't miss-inform OP about his upgrading possibilities.