Hi,
So i just bought a MBP and set up a wireless network in
my house. Nearly everything is taken care of except for
one thing. I have a windows desktop in the basement
which is connected to my printer. I plan on using my
laptop in my office upstairs. I'm wondering if there is a
way that i can connect to the printer downstairs without
having to copy files to my desktop and printing from
there.

Thanks,
If i left anything out that you need to know please don't
hesitate to ask!

I would get a wired or wireless printer server for the printer so you do not need to have the windows on everytime you want to print something, use less power too.

If you have a wireless network you can print wirelessly, if you have a wireless router like the Airport Basestation, it includes a USB port and you can wire your printer up to it.
If you are not using an Airport Basestation, what is your wireless router?
You could maybe contact your desktop computer, via Remote Access.

UNIX the secure programming language.

In the end we found using 'Chicken of the VNC' on a Mac the
best way of controlling a windows machine which has a VNC
server application installed. once this is all setup, you copy
your file to the windows machine and with VNC control the
printing. Plus you get to do all the other windows things
without going to the basement, etc.
Search for RealVNC on Versiontracker.com