I know this is a popular google search but I have followed all the directions there and have had no luck so far. My Windows 7 machine has numerous network shares that are all easily and painlessly accessible by anyone using 7 or Vista. I have 2 Windows XP machines on the network that get access denied errors when I try to access shares on the Windows 7 machine. The Windows 7 machines can access the shares on both the XP machines. All machines have the latest updates. No machines are running local firewalls All machines are connected via a wired switch All machines are under the same User Account without a password Can access XP shares from Windows 7 but not Windows 7 shares from XP Windows Vista and 7 machines can properly access shares. Edit: I got it to work for a while by setting it to work network, but now it stops working after my computer has been on for a day or so. Once I reboot my server it allows XP machines to reconnect, but there is some cut off points after so many hours XP machines can no longer connect.