Aside from the Mac jokes (lots of possibly work-necessary programs don't work with Mac either!)....

Lots of important programs don't work with Vista yet. Even HP has not updated drivers to Vista. Vista's release was way too premature, despite its many delays.
Windows XP is way more stable and useful right now.
I would suggest getting Vista disabled or uninstalled, and putting good old reliable XP on your new computer. The people you bought it from might be willing to give you an option to switch. Many people are angry with Vista's lameness and demanding XP instead, and sellers are listening.