A lot of folks, me included, like Network Magic for resolving network problems. You might want to try it.
My network consists of Windows Home Premium plus a Buffalo NAS drive. Every time I boot I get a notification that is "Could not reconnect all network drives" I then go to Computer and there is a red X on the mapped NAS drive. When I double click on the Red X, I get the directory listing of the mapped drive and the red X goes away.
This issue has been addressed with some positive results for other versions of Windows 7, However I am using WIN 7 HOME PREMIUM.... and the suggested corrective methods offered are not able to be utilized with Home Premium due to its lack of certain registry tools and options, as I understand.
This problem does not appear to be universal, in that not everyone with identical equipment (Both Home Premium and a Buffalo NAS) see this exact problem. so I am hoping that a corrective method is known that will restore my ability to utilize my Network NAS.