Hi everyone. Really like this forum and have learned a lot. but now need your help. My pc restarts every time I start my geovision system. I built a system running for about six months and all 4 camers worked but I reinstalled my os and software and now my system reboots whenever I enter geovision. I dont even need to login, just clicking the login part will restart the system after 5 seconds. I have loaded fresh drivers, moved the card to a different slot, loaded different versions of geovision, disabled virus protection, you name it. Here is a list of the system parts. board - mb-l4vxa2, cpu pent 2.66 ghz, mem - 512mb, os - windows xp prof, video - Nvidia Geforce mx 440, hard drive - wd 130 gb, Geovision card 800, have loaded versions 5.401 and 6.0. I don't really want to reinstall os again because its a pain but will if I have to. Any help? Thanks much and thanks for a really great forum.