Here are some solutions I have come across... I offer them only as a possibilites
 
Network Connection Fixes
1. Verify network drivers are up to date for your adapter.  
Click Start and type "Device Manager" and look for any driver errors..
usually a yellow triangle.
Click Start and type and enter "ev" and it will run the Event Viewer. Look
under Custom at the Administrative logs. Problems with initializing drivers are
logged here at startup. 
Click Start and type "perfmon /report" and press enter... it takes 60 seconds
to gather a comprehensive diagnostic report and then it presents resolutions.
2. Disable  NORTON and all AV programs and firewals. Norton 360 is NOT
compatible with Win 7.
3. Reset the router and test
4. Bypass the...