Android: no running Device

Question

I want to run my Android Project iwrote with emulators on my Android Device. The Device is Connected on an USB-Port. When I start the "Android Device Chooser" nothing happens. No running device in the "Choose a running Android Device"-Table is displayed. I tried to reboot the system(PC and Smartphone) while connecting. I tried every USB mode. I tried another Device( G1 and HTC Desire). Unknown Source is always true. I tried another Eclipse-Version(64 and 32 bit), tried another SDK(64 and 32 bit) and reinstalled the android sdk. I still can't see any device. Everything worked fine on my old 32 bit system. Now i have to work with my 64 bit lenovo. (both windows 7) somebody got another idea? Thank you. Fabian