I'm not familiar with the options avaliable with the Soltek Mobo. However, increasing the voltage supplied to the cpu (slightly!) will usually allow it to post and then boot into windows.
The Xp2000+ runs at a stock speed of 1.67Ghz which is quite good. It has an FSB of 133 (266DDR) so if you can get it to 166 (333mhz) it'd be nice :)