Help Me Please! WinXP Update (SP2)Q811493

Well Im running a P4 2.4GHz w/a 60 GB hardrive and 512MB
of RAM. I have a 128mb ATI Radeon 9800Pro Graphics card,
DVD Rom, and a CDRW. Sorry but I don't know my BIOS. I
bought the PC from HP. Ok, I uninstalled that update and
now when I turn on my PC it shows the XP start up screen
with the green loading bar at the bottom and while it's
doing this I hear two beeps from my motherboard. Theyre
low sounding beeps in a sequence of 1-pause-1 and theyre
not long beeps. Then the screen turns all black and the
PC restarts. I've already made sure the memory is secure
in its slot and have made sure every wire is connected
correctly. If anybody has any sort of info PLEASE HELP.
Thanks. O yea and if you need more info about the PC to
help me out please post and I'll try to answer them as
best I can.