Immediate reboot after booting up (2 Viewers)

[lightkid]

MediaPortal Version: 1.0.1
MediaPortal Skin:
Windows Version: XP
CPU Type: AMD Athlon 3000
HDD:
Memory: Kingston Ram, 2Gb
Motherboard:
Video Card:
Video Card Driver:
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card:
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
h.264 Video Codec:
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:

Hi guys,

immeadiately after the setup of the sql server my pc started rebooting and is now rebooting in a loop. any tips?!
very annoying... :-/

cheers and thanks!
denis