since I've installed internet security 2015 I have had a problem .normally when I come out of stand by( using windows xp home) the desktop wall paper flashes and then I'm taken to the sign in screen.now I get stuck at the wall paper. My only recourse is to shut down via the power button. To diagnose the problem I went ahead and shut off all the modules and one at a time turned then all on. After that things seemed to work ok.I was so relieved as windows xp is so slow to start. however after about a week the same problem.I narrowed it down to anti virus control. So now every time I want to go into stand by I uncheck anti virus control. And when I come out of stand by I recheck it turning it on.has anyone come accross this problem before.Just to note when I was running bitdefender 2011 and wanted to upgrade the same thing happened and bitdefender support was unable to come up with a solution so I continued to use 2011 with the new key I purchased for another year. and no problems so I think something was added in 2012 or later .