SNAP will not start unless run with admin rights

Which version of SNAP? There were issues with Windows admin installs for SNAP 2, but with so many updates, Windows is a moving target. There could be probelms introduced in a recent SNAP or by some Windows update.

Did you install SNAP as an administrator? In my workplace we have “corporate standard” Windows 7 systems. On some systems, installation of NASA SeaDAS 7 (based on BEAM, the precursor to SNAP) is blocked for ordinary users, so must be done using admin privileges. On the systems where the installation was done with admin privs, many functions fail when run as a regular user.