Okay, so after
HOURS of tinkering, I finally found a solution that works. I did this in XP, but I know for a fact there are similar settings in Windows 7(
not sure if they will accomplish this goal though).
The scenario:
I could access my PC via ES File explorer, but when I clicked on
MOST of the folders inside, i got "Account has no permissions" error. The only folder I did have access to was the default "Shared Documents" folder, and that pointed me to my solution.
Here is what I did:
1. Right clicked the Shared Documents folder on my PC.
-- The one that let me in via ES File Explorer.
2. Clicked Properties, then the Security Tab.
3. I Right clicked the folder I wanted to be able to access via ES File Explorer.
4. Clicked Properties, then the Security Tab.
-- I noticed huge discrepancies between the two.
5. In the Security tab of the folder I was wanting to share, I added all the users that were in the already accessible "Shared Documents" Folder
They were:
-Administrator
-Everyone
-Power Users
-SYSTEM
-Users
**To add them, click Add, then begin typing the name of the user/group you would like to add, then click "Check Names" and it will enter the correct, exact name, that is required.**
6. After you have entered all the names, click "OK" on that window, then "Apply" on the next one(
the properties window)
7. Wait for the permissions to be applied (I shared my entire 300GB 2nd HD so it took about 4 minutes, and gave me a not responding error, just be paitent)
8. Back in ES File Explorer, simply press "Refresh" or exit the appllication, and start it back up.
9. Hopefully you're browsing your PC files via your phone.

Let me know if this worked for you.
***Update***
I can confirm this works with Windows 7 too.