Hoping to get some help with my desktop that has stopped working. 
I have a custom built computer from ~3 years ago that won't load Windows properly. More specifically, it goes through the BIOS and starts to load Windows. I enter my username/pw successfully, but that's where the fun ends. About half the time, it won't finish loading my desktop icons (partly loading some of them) before freezing. The other half the time it loads them but it freezes up when I click on anything (e.g. opening my programs to check the core temps, voltage, ...). In both cases, it just sits there frozen and there's nothing I can do other than cut off the power.
So any thoughts about what that might be? My next step is to try to load in Safe Mode, but I wanted to get this post out here while I'm at work at a real computer. I have an ipad at home, and it's not as easy to work with.
Would my issue possibly be related to the power supply? I did notice my top fan on my Antec 8000 stopped working and I just replaced it about 2 months ago. Although I am positive I don't NEED that fan to keep temps under control except during intensive gaming. My other guess is just a hard drive failure. I am not sure how to get the files off of it if that's true.
Although I built the computer a few years ago, I would still say I'm only an amateur skill/knowledge level (at best), so many thanks for any help you can provide.
Not sure if it matters (please let me know), but I have the following hardware (off the top of my head):
Windows XP (yeah I know)
Nvidia GeForce 8800GT
Gigabyte P35 motherboard (forgot exactly)
4GB RAM
Intel Quadcore Q6600 processor
2 hard drives, primary is Seagate Barracuda (I think), secondary is 1TB 7200 RPM one

I have a custom built computer from ~3 years ago that won't load Windows properly. More specifically, it goes through the BIOS and starts to load Windows. I enter my username/pw successfully, but that's where the fun ends. About half the time, it won't finish loading my desktop icons (partly loading some of them) before freezing. The other half the time it loads them but it freezes up when I click on anything (e.g. opening my programs to check the core temps, voltage, ...). In both cases, it just sits there frozen and there's nothing I can do other than cut off the power.
So any thoughts about what that might be? My next step is to try to load in Safe Mode, but I wanted to get this post out here while I'm at work at a real computer. I have an ipad at home, and it's not as easy to work with.
Would my issue possibly be related to the power supply? I did notice my top fan on my Antec 8000 stopped working and I just replaced it about 2 months ago. Although I am positive I don't NEED that fan to keep temps under control except during intensive gaming. My other guess is just a hard drive failure. I am not sure how to get the files off of it if that's true.
Although I built the computer a few years ago, I would still say I'm only an amateur skill/knowledge level (at best), so many thanks for any help you can provide.
Not sure if it matters (please let me know), but I have the following hardware (off the top of my head):
Windows XP (yeah I know)
Nvidia GeForce 8800GT
Gigabyte P35 motherboard (forgot exactly)
4GB RAM
Intel Quadcore Q6600 processor
2 hard drives, primary is Seagate Barracuda (I think), secondary is 1TB 7200 RPM one