My friend sent me a link to download DivX and after the install an Alert popped up saying Rosetta needs to be installed in order to install Sentinel. I clicked cancel on that but am not sure what Sentinel was/is? If it was some old mac virus/trojan or something? Should I worry even though I clicked cancel, uninstalled DivX and deleted the .dmg file? file was sent via this link: http://hotfile.com/dl/33172607/3294882/Divx_7.0_PRO_for_Mac.rar.html is there a way to scan it to find out if it's infected? NOTE: currently running Snow Leopard.