I have had this problem for a while now, but it was usually fixed through exessive restarting until it did not freeze on me. Sometimes the computer would freeze before the windows 'welcome' screen comes up, while sometimes it would go for 1-2 minutes before freezing. In safe mode, where it wont freeze on me, I have ran disk check, defragment, registry fix, memtest, and spyware doctor with little problems showing. After doing all this I rebooted to normal mode and it still froze on me. I really don't know what else to do at this point and would greatly appriciate some help.
My system is an old Dell XPS 410 running Windows XP Home Professional, I think. It has been heavily modified over the past 4-5 years including new memory, a new CPU, and a new video card. The video card is the only recent thing I have installed and may be the cause of the problem, but I dont know how to check for this. If you need to know anything else just post and I will be sure to do my best to find out for you.
Thanks in advance