Hey Luc,
I think I will stick with the no reboot option anyway, but do you mind helping me with using powerCLI to upgrade Tools with these arguments /S /v "/qn REBOOT=R ADDLOCAL=ALL REMOVE=Hgfs,WYSE,ThinPrint"
Basically it install all components except HGFS, WYSE and THINPRINT. at the moment I manually having to do this on every VM, it would to do a batch from a list.