Windows 7: Trouble with setting up printers in XP Mode

I had found an article elsewhere that there was a way of setting up printers in XP Mode by finding the right TS port number that is pointed to your printer. The problem I am running into is that when I setup the printer using the right TS number through trial and error. I am able to successfully test this using Writepad, typing some text and sending the print to the printer through XP Mode. Then when I fire up a program called Membership Plus 6.0 (It is a church administration system) and try to print a report, it deactivates the TS port and I have to go searching for a new TS port. Is this the right way of configuring printers in XP Mode? Has anyone had Windows programs cause the TS port to de-activate? Is there a better way of setting up printers for XP Mode? I tried creating a print share on the Windows 7 side, then try creating a print que in XP Mode by using the shared printer, but it expects a printer driver for the printer and I can never get it install, because I always get an error message.

Any tried and true configurations would be much appreciated.