I have installed ActivePerl 5.10 in WindowsXp. When i try to run the code am still getting the below mentioned error "this Perl not built to support threads"

What you have downloaded probably isn't ActivePerl.

ActiveState no longer offers 5.10 for download, except if you paid for Business Edition and Enterprise Edition

If you paid for Business Edition and Enterprise Edition, you also paid for support, so contact contact ActiveState for support

http://downloads.activestate.com/ActivePerl/releases/