Hi Aimee,
SOFA is pretty self-contained these days so you could just delete the
sofastats folder from Program Files e.g. C:\Program Files\sofastats.
Everything SOFA needs to run is contained in the sofastats.exe file in
that folder so once that is gone there is no registry mess etc. In you
home folder there will probably also be a sofastats and
sofastats_recovery folder e.g. C:\Users\sofastats and
C:\Users\sofastats_recovery. Once again, just delete them.
What version of Windows are you running BTW?
All the best,
Grant