nowdays most of the people use window 7 and they get a good perfomance but some people don't use because it is costly but it is very cheap some of people download&upgrade their pc to window 7 but they need keygen,serial and activator so here it is Microsoft Windows 7 Ultimate...

                 This trick will let you detect whether your antivirus software is working or is just a waste. We will create a file which every antivirus sofware will detect as virus but dont worry it is harmless...

  keyboard dancing light trick                                                                        ...