I installed a new Zonet 1605 wireless adapter so i could pick up the wireless internet from my niegbor it does not work why?

You are not able to pick up your neighbor's network can be due to various reasons.
1) Check if the adapter has been installed properly. Check the device status in the device manager. It should say "This device is working properly"
2) The distance might be too much for you to receive the wireless signals.
3) Might be having any other wireless devices like a cordless phone near your computer which may cause interference.
4) Your neighbor's wireless router might be transmitting signals in 802.11a or 802.11n standards which is not compatible with Zonet 1605 adapter.
5) Your neighbor would have password protected his wireless network to avoid illegal use of his internet. These days there is more importance given for wireless security.

Thanks and regards,
Arvind S Iyer