Strange taskbar or explorer bug: not responding for a moment

[skyli]

Hello!
I don't know why is it, but i have these bugs:



The window is flashing(not responsing for a moment) and the icon disappears and comes again from the left. Same thing happens with firefox too.


I have an other bug too, when i hoover on a taskbar icon and click on a preview, sometimes it doesn't open for the first time, sometimes just for the 3rd time. :huh:


Could somebody please help me?

 

[skyli]

It happens with explorer too (the split second freeze (not responding). :S
Should I reinstall the OS?

 

[skyli]

And also the battery icon and the volume icon is missing from the tray sometimes (now also). Could it be due to a program, becouse i've enabled AHCI or becouse of the video card driver(it's switchable but now the switching is also not working)?