As already stated by others?
If you want us to help we should first know on which operating system you are (Linux, Windows, Mac, ...)
Do you have Perl installed through your operating system like on Linux/Unix (You would use your distributions packaging system to add or remove software then) or do you have activestateperl, strawberry perl, or compiled it on your own (In the last case you wouldnt ask the question i think ...)?