Since the old mouse has broken, we've been using my brothers G5 mouse. It works to some degree when connected via USB to this old Windows ME machine. However, the left click is not entirely reliable in games (well, Q3 online), it fails about 1 in 20 times and this did not happen with the old mouse. It doesn't seem like a hardware problem, it's pretty new and well looked after. I have tried to install drivers to correct this, but they won't install properly. I get this error message:

Does anybody know how we can fix this annoying problem? Thanks

Does anybody know how we can fix this annoying problem? Thanks