I had installed new OS XP but at the midlle while I was installing there was an error... it says

ERROR setup abort fake setup call himself instead original "Setup.exe"-Setup Abort!

Driver signing policy disabler reset register entry 1time.
Closed drive signing policy pop up 0 times.

I'm a student of IS but never in my life have seen such error... can any one help me on this matter... ill be looking forward

Have you managed to boot this machine since the rebuild ?
If not I'd simply start over with a complete format and reinstall of XP.

Also is this a genuine Micro$oft CD?

Thank you for your suggestion

See if this helps at all

How to Format Drive and Install Windows from Scratch
Lifehacker - Geek to Live: How to format your hard drive and install Windows XP from scratch - Feature

Well thanks for your help ,but it did'nt help.

I can't say that I've ever seen that error before, but this link might help you: DriverPacks.net Forum / fake setup call himself instead original "setup.exe" - Setup Abort

Have you tried with a different windows install CD? It sounds like the one you're using might be b0rked.

Also- these Google search results might help.
Google