Can someone please telll me how* to send themes *.sis from my PC to the 7610
using the USB cable?

Where are the themes supost to go?

Connect the 7610 via USB & then connect via connection manager in control panel. Once this is done the just simply go to application installer and transfer the *.sis file and then hay presto! The file will then be picked and unpacked to the phone.

If you need help just look for help using Pc Suite V6.