Do you have Service pack 1?? If not you can download the english version here: WinXP SP1a for Home/Pro ... You should also install the latest .NET framework: .NET Framework 1.1 Redist You should also check if your firewall (if you have one) is blocking the outgoing and ingoing conections.
Ya, Nvidia crashed and burned! ... The Geforce FX 5800U was a total flop! and the 5900U will be too! ... As soon as ATI opens up for the 9900PROs Nvidia will be left crumbeling in the dust!
I would recommend: 256MB for office use - Word, Excel, powerpoint etc. 512MB for gaming use and "light" CAD - UT2003, Photoshop etc. 1024MB+ would then be for server and workstations. I have 512MB myself and my comp handels anything I throw at it