The PikkuBot is fully executable with Windows Vista!
To avoid problems you should better not install it to C:\Program Files\PikkuBot, but rather directly to C:\PikkuBot or D:\PikkuBot, otherwise there could be problems with the two tools PikkuHelper.exe and PikkuStarter.exe .
If you install nevertheless to C:\Program Files\PikkuBot, then all .exe - files must be started under compatibility as the user “administrator”.