I've set up a network in the practice that I work, which consists of 2 servers, one for dental and one for medical. Both of them are running windows 7, and are on "home network" setting. Since last week I've encountered a strange problem which is causing me a massive headache . The problem is that when the medical workstations that run windows xp try to connect to medical server (shared files) , it gives this error :

but if they try to connect to the dental server there is no error. Every day if I restart the medical server the problem is resolved and I dont get any message, ubt I have to do it every day morning which is frustrating.