PowerEdge R200 Windows XP Prof

Good luck.  PowerEdge servers were not designed for client OS's.  I'm not saying that it is impossible, but it may be.  Are your drives connected to a RAID controller or directly to the SATA ports on the motherboard?  Which controller do you have?  You will need to find drivers on the websites of the manufacturers of the various devices (Broadcom for the NIC's, Intel for chipset, etc.).  Let me know if you get stuck with any devices, but first and foremost, you won't get anywhere until you get the storage driver sorted out.

yesterday i found out that windows xp support all devices except nic and video.

For nic i found a driver on the boradcom site.

For video and chipset i used the win 2003 drivers from the dell homepage.

Till now the system runns stabil.