I am using WINDOWS XP SP2 as my OS...
i am very interested in installing various themes to my pc..

i got one windows 8 theme which i installed ...

but, after installing my system started RESTARTING continuously ..
but, i dono where the problem was i just reinstalled the OS

now .. tell me how to solve the problem..
plzzz

Use System Restore OR Go to safe mode and remove theme & also remove unwanted programs from start-up:) AND do not forgot to scan your PC too

Well you might might want to start by Downloading and installing SP3 for Windows XP = http://support.microsoft.com/kb/322389

Also make sure you have been Downloading and Installing the latest updates from the Windows Updater too as these contain very important updates especially for any security issues.

Also what type of themes are you trying to install on your machine, as many third party themes for older system tend to need a "patch" to be able to install these third party themes, not that I recommend doing so but there are plenty of them out there.

As Uvais suggested try a system restore.

Also this may also interest you here = http://www.winxsoft.com/8tp/download.html

It is the 'Windows 8 Transformation Pack 2.0'

I installed themes that were given from this forum itself...
but whenever i installed themes ... my pc restarts frequently and i need to format my pc without knowing how to recover the pc...

plzzz help me..

how to go to safe mode or how to recover my pc??

For safe mode

http://bertk.mvps.org/html/safemode.html

can we get WINDOWS XP SP3 with REPAIR option in it to download freely in any of the websites???

so that i can install a fresh copy of OS to solve my problem???

So you want complete ISO of WXPSP3

Well it is not possible to Download Windows XP+sp3 from microsoft or any legal way and we do not discuss about illegal Downloading of windows @ Forum

SP3 link

http://www.microsoft.com/download/en/details.aspx?id=24