I noticed everytime I play Open Arena, my Spy Sweeper finds an adware called Powerstrip. it might be a good idea to find where it's hiding and get rid of it in the next release.
1- PowerStrip isn't an adware, it's a GPU utility commonly installed with ATI drivers. Thats why it's called everytime you launch a game like OpenArena. You can uninstall it from the windows control panel.
More infos on Softpedia (a software repository specalised in adware-free softwares):
http://www.softpedia.com/progDownload/PowerStrip-Download-6833.html2- OpenArena is a free software (as in beer and free speech) so you can take a look into the sourcecode if you doubt.
3- Take another spyware spotter like SpyBot, because Spy Sweeper is highly unreliable.