Product Key Finder
Full user review
"Product Key Finder contains adware."
I don't know. Not installed.
VirusTotal detected Win32/OpenCandy (adware). See
From v 2.1 to v 2.2 the file size increased five times (281 kB in v 2.1.3 to 1.5 MB in v 2.2.4) because of the adware.
Risky. The adware make it worthless.