I have xp-pro, sp-2 and i wanted to upgrade to sp-3, so i bought this suppose sp-3, build 2(on the black market). I tried upgradng and after I still saw sp-2 on my-computer property! I decided t re-insert the disc and start again, but the cmputer now give this error message 'Fake Setup call himself instead original "Setup.exe". -Setup Abort!' when I click OK, the computer re-boot and says 'setup is being re-started, ' and after sometime it goes back to d error message and cycle continues! If i try t remove d disc and boot, the computer simply ask for d disc again!
How do I get the system working again?

Lol, your OS settings have been altered.I m afraid you ll have to do fresh installation.Get a gud and wking xp cd/dvd and boot from the cd rom