That's bad to hear. Have you tried to restart your PC and also checked for Windows updates? Maybe you are missing a .NET framework or so which would required to run GunZ. Also, try this:
https://freestylersworld.com/showthr...ng-you-need!#5
You may have to install Microsoft 2010 Redistributable which is located in the "C:\Program Files (x86)\Freestyle GunZ\redist" Folder. If you're using 64 bit OS - install the x86 AND x64. If using a 32 bit OS, install the x86 only. If it asks - run the repair option.
Or if you can get your hands on a copy of Windows 7, you can also install that on your Laptop. If it can run Windows Vista, I'm pretty sure it can also run Windows 7.