There could be countless causes of this. When you post your question, include the specs of your machine with as much detail as you can. Also, be a little more specific with what the problem is. When does it happen...at boot...opening a certain piece of software..etc.
Some of the most common problems that could beh causing WinXP to hang are bad/wrong drivers, memory issues, PSU issues, heat, and other failing pieces of hardware along with a multitude of software settings and incompatibilities.
These are the type of threads you mentioned in your other thread. I need help, but I'm going to tell you anything about the problem that might assist you in any way possible!!!!!!
I predict a 53% chance of memory failure. Run memtest86 for several hours/overnight. 0 errors is the only acceptable report.
I predict a 29% chance of a failed power supply. Replace to test.
I predict a .01% chance of a OS issues since you reloaded, probably because it was locking up in the first place. When you replace 100% of the software, your likely to replace all software errors.
87% of all statistics are made up on the spot.
edit: wow, how machine machines are you supporting? You have a lot of threads with different OSes and different hardware..
solved the issue, was a hardware/driver problem. i have lots of questions, plus lots of machines sitting around, just trying to learn what i can, with you guys' help