[otrs] GD module missing

Hello all, I am using otrs 2.4.8 on windows OS recentlt i required need to generate Stats ok as was trying to generAate graphs i got an error NEED GD! so ran script checkmodule and found that GD module is missing now i tried to install it through CPAN install GD and it showed loaded ok . but still in my checkmodule its showing me an error saying GD module missing. Any help as wat should i do to get that module installed. shrikant