Boot the computer and plug the USB adapter in. Go into Device Manager, double click the wireless adapter to open its "Properties" sheet and click the Driver tab. Click the "Update Driver" button, select 'no' to using Windows Update to find software, and in the next page select "Install from a list or specific location. Then browse to the folder containing the drivers in the CD.
<<< Just recently bought this to make a Wi-Fi access point out of my PC >>>
Not quite sure what you are trying to do, but installing a Wireless Network Adapter doesn't make your PC a Wireless Access Point. The adapter connects *TO* a Wireless Access Point, most commonly the one in a wireless router.