It works great on both Win7 and XP. It works on the laptop that on the desktop. Sometimes it happens that in the folder Images, there is some image "gpi" with some error. This causes GPIBrowser to crash. Try renaming the folder you are using so that the software asks you to choose the new path of a "GP4.exe" and you try, for example, to give it a GP4.exe of a GP4 without changes and you'll see that it will work.