Ive been looking at the differences between Avast Pro and Free versions. I know that Pro incorporates a script shield as well as a sandbox. Is the script shield necessary and what does it detect? Im on Windows 7 x64 Pro. Im not sure if I need the script shield. If its what Im guessing then I doubt I need the Pro version. The only reason I can see to get the Pro version is to disable the uber annoying ads. After all FF is sandboxed as is IE.