I've noticed some people have had problems with Vista and autohotkey sc<x>ripts but I've got a setup here to get it working. Doing so will make you lose some pretty colours while running pokerstars but it's not a huge issue, and whenever you quit pokerstars your appearance settings will go back to normal. So:
(You must be running with 32bit colour in your desktop settings)
1. Right click -> 'Properties' on your pokerstars shortcut
2. Go to 'Compatability' tab in the properties
3. Under 'Settings' check "Disable desktop composition" (This needs to be done because the betpot sc<x>ript works off of images/colour in the pokerstars windows and the pixels need to be the precise colours for the sc<x>ript to work)
4. There is a couple possible options here, try them out to see what works for you:
4a. Find your "AutoHotkey.exe" and right click -> 'Properties' and under 'Compatability' again set "Run this program as an administrator" under the 'Privilege Level' area.
4b. Find your betpot sc<x>ript (probably named 'BetPot-v0.2n.ahk' and do right click -> 'Compile sc<x>ript'
5b. Set the resulting .exe file to "Run this progarm as an administrator" the same as outline in step 4a
6. Pot some bets!
You may also want to install your autohotkey to a folder NOT under "Program Files" since that folder is pretty locked down by Vista. I'm not sure if this is necessary but it might help if you are having issues.