Yup---------- I hope you have a floppy drive!!!!
Please be prepared if you choose my advice. Get boot disk, my favortie is UBD (Ultimate boot disk) or any other you choose. Delete all partitions and format hard drive. If you can't format hardrive than, it may be bad. Format than power system down. Unplug pc from power source and hold in power button(power drain). Open case, unseat and reseat memory. Then power back up and try reinstalling then. If still crashing and you have 2 memory sticks than remove one, and try all combinations of slots and cards. Restart computer, go into BIOS and reset default values. For most pcs its F-1,F-2 or delete to enter Bios/ then f-5,f-9 to reset defualts and f-10 to save and exit. If no function key values shown on bottom pain than tap escape once and you should see a menu apear.
Then with UBD in floppy drive try to reinstall windows. If that fails, see if you can get your hands on another 'imaged' drive. Which basically means unplug a hard drive from a working computer and plug it into yours. If it hangs than it def some hardware. Also you can try 'imaging' (installing windows) on that hard drive inside of another pc.
Hope that all makes sense, if not post questions- or message me, I'm on 12hours a day Sun-Wed.
Good luck--