You have a pretty old system but you may be able to get an XP driver to work with Windows 7 by installing it in compatibility mode with WXP or WXP sp2 - To do this click the below link and download the driver, firstly, then this:
To install a driver/program in compatibility mode - right click the setup.exe file - click properties - click compatibility - check run in compatibility with XP
/vista etc- check run as administrator - leave the rest blank. Start setup.exe and install.
Download: Drivers and Downloads
Have a look at this link for details (note this also works for W7) : You cannot install a device driver by using its installation program in Windows Vista