Bitdefender Antivirus V10, Help!

I'm using BitDefender v10 plus and have the lisence key.

My problem is: After install it. I updated it via automatic update function.

After update and restart, BitDefender doesn't show the Icon on the tray, and when I right click a folder to ask it to scan, it says files are altered, need to re-install.

I re-install several times, it runs well before update, and die after update...

Does any one know how to solve this?