3 GB RAM
You didn't specify if you are running Windows in native (Boot Camp) or virtual (VirtualBox/VMWare/Parallels) environment.
I'd consider a RAM upgrade if you want more speed in either case.
B
Hey,
I'm running on Bootcamp
I can only add one more GB of RAM.
(and if you're the lucky owner of a Late 2007 you might be able to go to 6 GB).
I don't have an option/alt key on my iMac keyboard??
Do you have the keyboard that came with the iMac?
If so, it is between the CTRL and CMD key, the second key left from the space bar.
If it is a Windows keyboard (for whatever reason), use the Alt key on the right of the Windows key and on the left of the space bar.