That seems like a BSOD. Tell us what it tells you (a rather big error message).
From what you tell, it's either a hardware failure, a bad driver (tell if you installed such recently) or malware (trojan, virus, rootkit). With details from the screen we might be able to tell more.
Also please tell about your version of Windows XP (initial, SP1, SP2, SP3), firewall, antivirus, P2P usage and internet connection.
Also tell what happens if you boot in Safe Mode (press f8 at the right moment, and choose Safe Mode). While there, you might also try "last good configuration", but I don't think that will be the solution.
I have a Dell Inspiron with windows xp home edition and when i start up my computer all it does is keep loading on theWindows Xp sign....and then about 5 min. later the screen turns blue. ANy suggestions or comments plz help