Softonic has been around quite awhile, and I don't know of any problems.
Is which a 'safe' version? T-encoder or MovieMaker? I have no use for moviemaker, so I ain't gonna even put the frying pan on the stove.. ;>)

T-encoder was listed at alt.comp.freeware a couple of times, and it is pretty well accepted, though some payware programs are probably better.

I seldom need to convert or edit videos, but have Avidemux as a standard, just in case.
I have ummm... hmmm... about a dozen video players of various sorts, of which I use maybe 2-3 regularly. Potplayer and VLC mostly. My camera (not a phone) takes videos, and I can play or edit any of those... though I seldom do.