Weird problem with the Desktop and EXPLORER.EXE freezing

[Cr4z33]

Since 3-4 days I am struggling at fixing some major problems I am having with my OS.

If I right-click Desktop icons the EXPLORER.EXE task freezes and I have to kill and reload it.

If I press SHIFT+CANC to instantly delete a Desktop shortcut/file/folder the same happens.

If I click on the Windows Explorer icon in the Quick Launch nothing happens.

If I open Windows Explorer in any other way, whenever I click on a subfolder in the right pane a new Windows Explorer window comes up although I choosed not to open that way in the options.

I have tried to scan my system with whatever I could think about: KAV 2009, Spy Sweeper 6.x, SpyBot S&D, HiJackThis, AdAware FREE and Malwarebytes Anti-Malware v1.36.

They all say my computer is OK.

I even tried to check if there were problems with the Context Menu and there were not.

Wth else can I try to detect the problem?

[Cr4z33]

Yesterday Windows Update fixed all issues but the ones below:

If I click on the Windows Explorer icon in the Quick Launch nothing happens.

If I open Windows Explorer in any other way, whenever I click on a subfolder in the right pane a new Windows Explorer window comes up although I choosed not to open that way in the options.

Dunno what to think about.

Please help!