If you're running Mcafee or Norton for your virus scan, that will slow you computer down considerably. Try switching to AVG Free for virus and spyware apps. I'm running Vista and have been for a couple of months as well as Office 2007. It's ok, but nothing earth shattering.

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99 ML320
94 SL600
92 SL500
95 E320 Cabriolet
87 560SEC
86 300SDL Grease Car
80 380SLC Euro

13 Fiat Abarth
02 Maserati Spyder Cambiocorsa
00 BMW Z3
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80 Ferrari 308 GTSI
88 Jaguar XJS12 H&E Edition
99 Land Rover Discovery