Vista - Vista Machine Takes Over Print - XP Printers Can't Print Afterwards

Hey all and thanks ahead,

Background before the question:
I work for an architecture firm and are the test subjects to upgrading because we are the graphics department with all the programs that hog memory and have all the 64-bit programs... Adobe Photoshop CS4, 3DS Max 2009 and Revit 2008. I recently upgraded my machine to Vista Business x64 and all my co-workers except for one other (who also upgraded with me to Vista Business x64) are all on XP x86 machines.

Okay, we have problems with the network printers that are shared on a server machine. Issue is, everyone can print all day til we print out something. (Yes, are machine recognize the printers... it is not a I can't see them or are they shared on the server). After it stops everyone, we can keep on printing ourselves. The only way to fix it is to reset the server machine to recognize the printer again.

Is there any local fix from the take over from happening... or is it on the server machine? Actually, what is the fix? Currently are work around is to jump on a computer that hasn't been used by anyone for years (XP x86) to print.

Thanks ahead
Topher

Forgot to tell you, it is an HP 4500mfp printer and HP CJL 5550 laser printer.