When sharing the entire content of a partition with other computers on your network, you might see that it is listed as shared but in fact it cannot be accessed. Other users trying to access your partition might receive the following error message: '\\ComputerName\Partition is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. Access is denied.'
In this tutorial we will show you how to solve this problem.
Our solution aims to solve only the error shown below. If you receive other messages, it might not be an applicable solution.

First, open Windows Explorer and right click on the partition which you have shared. Click Properties.

In the Properties window, go to the Security tab. Here you will see a list with the defined groups and permissions. If the group called Everyone is not listed, then you need to add it. If it is listed, you need to check the defined permissions and set it to at least Read & execute. To add the group, click Edit.

Now click Add.

In the 'Select Users and Groups' window, type 'Everyone' and click OK.

In the Properties window, click OK.

Now you will see a window titled Windows Security. Wait until it disappears.

From now on, your shared partition will be accessible from other computers.
Related articles:
How to share files and folders
How to enable network discovery and file sharing
How to share a printer with other computers from your network
Comments
Procedure failed
I have a new VAIO laptop with Windows Vista Business w/ SP1.
I followed your instructions to share drive C but, at the end, I got a message:
Error Applying Security
An error occurred while applying security information to:
C:\Boot
Access is denied
CONTINUE CANCEL
It seems that now is impossible to share drive C root. If there is a solution, please let me know.
Thank you.
Correction - Procedure worked
I just sent a message saying that the procedure to share drive C didn't work. After I got the error message, I tried to access the shared drive C and it worked.
Windows says it's wrong, but the access is liberated.
Thank you.
Just the beginning.
This excursion into permissions is just the smallest snippet of what can be done with them, and with Vista and various types of users being enforced, permissions, ownership, users, denials, etc are a vital new part of usage.
Just imagine converting your XP machine to behave properly under the new Vista rules - changing from the bad behaviour of Administrator to that of a Limited User. How would you do that?
Next consider a prior Vista drive mounted in an external case attached to a new installation. How would you get the files off, user by user?
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