About 2 weeks ago my Windows 7 taskbar started to freeze randomly and sometimes many times in a row. I can't click on any taskbar icons or start menu, also I can't close the window currently open, but windows itself works.(ex. i have Firefox open and then comes the freeze, but i can still scroll the page up and down and click on the links, but i can't close/minimize etc.) Only way to unfreeze is press Ctrl+Alt+Delete and open Task Manager and then Close it. I have looked for solution in the internet and. I found that causes of this may be wireless mouse(i don't have wireless mouse), file at C:\Program Files (x86)\RelevantKnowledge\rlvknlg.exe and for someone deleting it in Safe Mode has solved the problem, but I don't have such file. I discovered that it freezes even in Safe Mode. I already reinstalled windows and still have freezes. I tried to reinstall graphic drivers
but this too didn't help.
I have tried and couldn't figure it out myself so I hope that some one else can help me.
Thank you in advance.