Hi! I have a very unusual problem with my macbook air Snow leopard operating system. I installed Snow leopard relatively recently and not used it too much. But from yesterday the mac OS started to act weird. First the boot time increased and also the Login window appeared at start but I never changed something in Mac Os preferences. Then another problem and the main one is the fact that when I right click some of my folders or files on desktop or in any other place some of them hang up the system, a specific colored wheel starts to roll and i lose for about 30 second the control of the computer. As some program is struggling to to something in this time. The same thing is happening with the icons in Dock. Another weird thing is that this issue seems to affect mainly the files and folders I copied on hard drive and not the one that came with Snow leopard.