I've found that the basic Vista machine is best with 2GB RAM (check) and any dual core CPU (one short.) For gamers, we have to get the baddest graphics that empties the wallet.
Bob
My wife has a Inspiron 1501 with Windows Vista basic, Mobile AMD Sempron processor 3500+ 1.80ghz, 2gb ram, 32 bit. It runs incredibly slow. I just got a new HP with 2gb ram and an AMD processor and it runs circles around this thing. The windows experience index rates the Desktop performance for windows aero at 2.4. Any ideas on how to get the thing going any faster? Ive even tried dell tech support and they made it worse.

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