Known system changes:

Files
%CommonDesktop%\GuardWWW.lnk
%ProgramFiles%\GuardWWW Software\GuardWWW\GuardWWW.exe

Folders
%CommonPrograms%\GuardWWW
%ProgramFiles%\GuardWWW Software

Registry Entries
Key: HKEY_LOCAL_MACHINE\SOFTWARE\GuardWWW
Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\GuardWWW