Sorry that the subject line is very descriptive. But I will try to explain everything. I have a home built system with a genuine intell cpu and a biostar P4m900-m4 motherboard. I have 2 gigs of ram in there but not sure what brand or anything right now. I can find out if the info is needed. I am having a problem installing windows. I have tried XP, vista and 7. The hard drive is formatted but each install hangs during install. I have tried the following.... Different hard drive Diffrent IDE cable Moved the IDE cable from the primary IDE slot to the secondary one. I did not think this would work, but worth a shot anyways. I looked around in the bios and changed a few settings. I restored the default bios settings. (I must say that this bios seems to have a huge amount of options you can change. I have a laptop where I swear there are not more then about 6 things you can change) I know that more then likely the next logical step is to change out the ram. But I am not sure where my other ram is right now. Oh and I also ran something called Bart PE I think. It is a "windows like" operating system that will operate just of the DVD. Really kind of makes windows security pointless trying to protect files. But a nice little thing to have around. This ran overnight without a problem and no freezing. Anyways, like I said I know I should try changing out the ram. But I have just not gotten to it yet. But I found it dd that the DVD OS ran without a problem even though it too would use the ram. Just thought I would check in here to see if anyone has any other ideas, no matter how crazy they seem.