Network adapter has to be disabled then enabled after start up

Hi, we 12 Dells on an office network, all working fine except that one Optiplex 3310 with 8mb RAM running Windows 7 professional doesn't connect to the Internet on startup.  Each time we start up the computer it can see the network, storage drives etc but cannot connect to the internet. If I disable then enable the network adapter it is fine.

One suggestion I received was to uninstall the adapter then install it again, but just thought I would ask here before I try that.

Many thanks