Vera Noest is a MS VIP, and provided this information on her site. It works like a champ, but you must follow the steps exactly as she has detailed, or it just won't work for you.
1. perform a normal installation of QuickBooks (in install mode!)
2. reboot
3. enter install mode again (change user /install), start QuickBooks and activate it by entering the registration code (this is a crucial step, and must be performed immediately following the reboot
4. go back to execute mode (change user /execute)
copy the %systemroot%\Intuit folder into each users %userprofile%\Windows folder
5. create a Quickbooks Users group
6. add your users to this group
7. give the group Full Control to HKEY_LOCAL_MACHINE\Software\Intuit\QuickBooksRegistration
8. give the group Full Control to HKEY_CLASSES_ROOT\.QPG
9. give the group Full Control to HKEY_CLASSES_ROOT\obja.obja
10. give the group Full Control to HKEY_CLASSES_ROOT\Quickbooks.application
11. give the group Modify rights to the Program Files\Intuit\Quickbooks Pro folder
12. Also make sure that clients use short names for printers if they need to print to a redirected local printer. Quickbooks cannot handle long printer names. You will get an "assertion failure" error message if the name is too long.