If you downloaded from the makers site, ask them to comment.
If it was downloaded from any other download site, realise that those often include adware. Then back to the makers site.
Kees
I used to use Puran Defrag with no difficulty. Recently I tried to download it again and it was blocked and cited as a malicious software. Has anyone else experienced that?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic