I am not sure how you originally installed QRWIN - but to find out what files it installed and to where, you can simply go to the QRW program folder and open the crwsetup.log file.

Apart from the main QRW folder, there will be files distributed in the Windows folder and some sub-folders.

I believe that if you had used the Windows Add/Remove programs to install QRWIN, you could have used it to uninstall most of the files as well.

Regards