Then use Fusion or Parallels. An added advantage of using virtual machines is that in either Fusion or Parallels, you can have the Office:Mac apps open in one window, and Windows Office apps open in another, and you can drag/drop/cut/paste, etc. between them. I dumped BC in favor of this approach early on - while the booting itself wasn't so bad, if you are using only office productivity apps, having the ability to run these apps in a window on the OSX desktop was a large productivity boost. I also think that in an office environment, virtual machines are easier to administer than BC partitions, but that's just my two cents. BC makes a lot of sense if you need the computer to run natively (e.g., take advantage of a separate graphics card) but for Office apps that's not necessary.
One caution re MS Office: Office:Mac does not support vBasic macros, so if you are using files with them you'll have to work a bit on the translation.
You should download the trial versions of Fusion and Parallels and try both to see which you like better. With respect to Windows, both are essentially feature-equivalent although the interfaces have different styles. If you plan to administer the software over a network or may later wish to use other OSs, I think Fusion will serve better. But for single-user installations, they are about the same. Both are excellent.
As for the viruses, you absolutely need virus protection in any Windows virtual machine or BC partition. Pick your favorite and install them. The good news is that whether you go with a VM or BC, any viruses you get on the Windows side will not infect your Mac volume.
Good luck!
