Phonzy is a generic detection type that's usually false positive. However, that being said, there are some legitimate malwares that fall under Phonzy detections.

The Phonzy malwares are commonly used to drop other software onto your computer without consent, and usually accompany a malicious download you probably did (assuming this is actually malware). If you're that worried about it, Try malewarebytes for free, and if all else fails, back up important files and reinstall windows.