computer keeps on rebooting

I am trying to fix a problem with a Dell OptiPlex GX520 with XP SP3, MS UPdates are up to date. which has/had many problems including can not go into Safe Mode by pressing F8, CTRL key, F12 the only F key that I pressed and worked is the F2 key to get into setup.

The computer has a ton of malware/spyware and a couple of Trojans. I could not open up AVG (paid version). I cleaned up what I could with malwarebytes, sypbot search and destroy, glarys utilities SuperAntiSpyware and I still could not open up AVG. I decided to delete AVG and reinstall it however I could not delete it through add and remove programs, so I deleted AVG directory, went into regedit and saved (exported) regedit, deleted all instances of AVG in regedit and rebooted. now the computer keeps on rebooting, I get the dell screen then the Windows XP screen and then it reboots.

I still can not get into Safe Mode, I tried booting from a XP CD after I made sure booting from CD was first in line to boot from and it will not boot to CD. I can boot from the CD on another computer. I made a bootable XP USB thumb drive changed the boot to boot from USB and still I can not boot up. it goes from Dell screen to windows XP screen and reboots.

Does anyone have any other suggestions I can try before I take the Hard drive out and retrieve all the data on it, format it and put it back into the computer and try again rebooting from the XP CD?

Thanks in advance.

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