You don't need any software to run a USB adapter (I assume that this IS a USB adapter that we're talking about?) in 95% of cases if running Win XP.
Are you running XP?
If so, remove any and all Netgear software that may be already installed, uninstall the adapter from Device Manager, then reboot.
Plug it in, let XP start to install it via the New Hardware Wizard and grab the driver from the CD when asked for it.