I use powerarchiver for my 7z files. Never had any problems. It's a very good compression program, try it if you haven't already.
If you are using it, did you obtain it from a genuine trusted source?
Viruses though, don't get me started on that one, I always ask myself "why". If a person is skilled enough to write modern PC code, why do they devote their skills to what amounts to nothing more than vandalism. Anyway, I guess that's a discussion for another thread or forum.
Good luck with your compression issues
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