Hi Just joined, looking for clues! Last week I started PC, a little box appeared on screen, saying a file was not loaded. This file (zkbuygp.dat) I can find no ref to on any Google search. Being suspicious I tried to run Antimalwarebytes, scan would NOT run "prog blocked by group policy", neither would M'soft Sec Essentials. BUT MSE did run when I opened in Safe Mode. I can't find much info re 'blocked by Group Policy", what there is seems confusing, I wouldn't feel confident trying to amend Registry entries for sure. I uninstalled AMBytes, and downloaded a new version (trial), which runs ok, or at least appears to. I AM WARY, as this AMBytes pops up a little box, just now and again, saying it has blocked a 'threat' from the i'net. I WAS NOT AWARE that AMBytes runs in real-time, guarding against online threats, I thought it does scans. All this started on April 9th, day after the XP furore, shouldn't affect me as I have Windows 7 and IE9. I have also downloaded and run the Kaspersky tool (TDSS?) didn't find anything, and Comodo, same. Is my AMBytes ok, and what's the right info re this 'blocked by Group Policy' stuff? thx Tony