DHCP did not provide an IP address

I installed version 3.5.57173.439 on anew computer. This version has a problem but is running without a problem on a second computer. The issue is simple: after installing a certain number of programs and updating the data base of Comodo. the laptop is unable to obtain an IP address from DHCP over WiFi.
However, if I power cycle the access point le laptop can get an IP address.
Can some one guide me out of this?