There are some security packs in the market that are pops up a false positive alerts for many apps - this is a well known and well documented phenomenon, you can find a lot of information about those false positive alerts by running Google search.

If you get Virus/Trojan/Spyware Alert Please try to re-download the file directly from:
http://www.photopos.com/photoposfreeTrail.asp

If you continue to have problem please contact your antivirus provider - as it seems to be a false positive (a false positive alarm).