I think I have tried everything.

[Swish]

Starting with the basics/obvious - have you shut down everything that you don't need running? I'm in a similar position with my laptop at the moment, it freezes/hangs if I have too much on the go (including trying to view a PDF, weirdly).

Type 'msconfig' into your start/Run bar at the windows logo menu and look at the startup tab... is there anything on there that's running but doesn't look important? Be careful not to shut down key programs but I stopped a bunch of needless shit running as the computer starts up.

I don't know if that's too general, or if Intel Dual Cores are poorly designed and it needs overclocking to operate EQ normally or something?