I can't tab in and out of this game, so I would really like to be able to run the game in window mode. Are there any hacks or whatever to do this?

You will need:
Microsoft Virtual PC '07 or '04 (I think '04 is your best bet as that doesn't have restrictions on which type of PC you can use it on (home or professional), only warnings). Get it from the microsoft site.

A copy of another older version of Windows that will run WWP (preferably '98)

Instructions:
Make a virtual PC and install 98.
Go into window mode
Install VPC additions (in the menu option)
Install WWP onto the virtual machine.
Copy your save files by drag+drop
Uninstall VPC additions (in add + remove programs), otherwise the mouse completely ****es up
Run WWP
Rejoice

virtual pc 2007 runs fine on winXP home sp2. it just prompts you about voiding all support as per the EULA.

Oh. It doens't on vista (I tried setting up a VPC on someone else's Vista machine of XP and VPC wouldn't install).

probably because you need buisness or ultra vista for virtual pc to operate. somewhere or rather mentions that only the top end of vista versions support virtual stuff due to licensing differences.