OPTIPLEX GX150

I AM NOT SURE IT GAVE ME A CHOICE OF SAVING THE CHANGES. THIS COMPUTER CAME WITH 2000 PROFESSIONAL, I UPGRADED TO WINDOWS ME, THEN TO XP. IT STARTED SHUTTING DOWN AND RESTARTING, OVER AND OVER WITH MESSAGES OF CROSS LINKING, I DELETED THE PARTITION, AND CAN'T GET ANY THING ON IT WHEN I GET A STARTUP WINDOW EXCEPT  [ FILE NTFS.SYS CAUSED AN UNEXPECTED ERROR (4108) AT LINE 5091 IN D: XPSPRTM\BASE\BOOT\SETUP\SETUP.C

NO. SO FAR NOTHING HAS WORKED. I FORMATED AND SET UP OS ON THE HDD USING A DELL DIMENSION 8100, SO I KNOW IT IS NOT THE HARD DRIVE THAT IS THE PROBLEM.  WHEN IT BOOTS UP IT ASKS IF I WANT TO BOOT NORMALLY OR SAFE MODE, ETC., IT  DOESN'T

MATTER WHAT I CHOOSE, IT STILL REBOOTS TO THE DELL LOGON SCREEN.

FULL VERSION WINDOWS XPSP2 2002 EDITION.  JUST REDOWNLOADED, SAME THING. I DID DELL DIAGNOSTICS AGAIN IT SAY'S EVERYTHING PASSES, EVEN HARD DRIVE.   BUT THE COMPUTER WAS DOING THIS BEFORE I TRIED TO REINSTALL HARD DRIVE. IT WAS GETTING CROSS LINKED MESSAGES, AND REBOOTING, THAT IS WHY I DECIDED TO REINSTALL THE HARD DRIVE.

THANKS