Upgrading OCS Inventory Agent

Hi, every time we try to upgrade latest version (eg. 2.1.0.3, 2.1.1.3, 2.2) we have lot of trouble coz older version of OCSService.exe file are not updated (due to "file in use").

We are not able to complete installation without a reboot (removing older version, rebooting, installing new one).

I think it's a silly situation...

Please solve it