In fact, this problem seems to have nothing to do with the system, generally in the local area network to make these shared folders, you need to change these places, the following simple list of local area network shared folders need to be modified.
1
Where to modify:
1: Turn off the firewall
2: Open "Guest" account
3: Shared folder allows "Guest" account access
2
Shutting down the firewall
This is very simple, in the Control Panel, you can easily see the firewall, and then shut it down. Remember to turn off some of the software walls, such as Skynet. These firewalls are also likely to cause inaccessible access.
3
Open the "Guest" account
In the control panel there is an account, the guest account in it to open it on the line.
4
Shared folders allow "Guest" account access
This basically does not want to set up, under normal circumstances is allowed, if the above two has not gone to set up here. Just add the Guest account to the permissions of the shared folder.
The above is about how XP computers cannot access the Win7 system's shared folders. 99 of shared file access issues can be resolved through the 3 methods above.