Regarding My Future Certification Courses – Can Somebody Help me ?

Hi all,

I have complete My Bachelors in Information Technology. I am working as a support Technician for Windows XP Operating system.

I want to my MCSE Certification. But I am not sure Which Client Operating I should Chose either Vista or Windows XP.

So i am Expecting some one to guide me in Certification and which field it would be better for me to get into.

Please do reply me. So that i can achieve a prosperous career.

Thanks,
Anish