Find the driver for XP and do this

1. Place the driver installation file on the Desktop.

2. Right Click the driver installation file and select Properties/Compatibility Tab. Select the appropriate options in from the list in the following image.

3. Click Apply/OK.

4. Right Click the file and select the Run As Administrator option to install.

I also recommend that you contact the maker of that hardware device and inquire about future driver support for Windows 7.