File sharing in Windows 7

"The user you are authenticating as must have BOTH read rights to the share and read rights to the folder/files of that share. (Assuming you are sharing on an NTFS drive).

Go to the folder, and grant ""Everyone"" full control of the shared folder. (Later change this to ""modify"" if everything works)

(Grabbed image from google images; you should select ""Everyone"" ideally. If it's not in the list, hit ""Add..."" then type ""Everyone"". Once this works, you may want to consider limiting access to local users)"

"Try the following, but please note you make changes to the registry at your own risk:

Go to your Start Menu and press 'Run'.

If you do not have Run in your Start Menu you can find the Run program in your Programs folder, then select Accessories and choose Run from that list.

Type in ‘regedit’ and press OK.
Search for the following location:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

Double click on 'everyoneincludesanonymous' and change the value data to 1.
Double click on 'NoLmHash' and change the value data to 0.
Search for the following location:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters

Double click on 'restrictnullsessaccess' and change the value data to 0.
Close the Registry Editor.
Restart your PC."