K33926 white square problem
 

I just bought the K33926 Docking station.
I installed the software and everything works well except one thing.
When my computer goes on standby and I log back into my session, there is a white square that appears in the top left corner of my desktop and I can't remove it.
The only way to hide this white square I found is by rebooting my computer ...
I have Windows 7.

Anyone has an idea how to solve this problem ?