A few weeks ago, I installed Windows 7 Ultimate, Build 7600 on my Gaming Computer and Laptop. Everything was wonderful, until I tried to access the files on my Windows XP File Server. It would constantly ask for a password, so, after trying numerous 'fixes' on the internet, I tried my own way, which worked! So I was very happy.
Step 1: What You'll Need
A Windows 7 Computer
A Windows XP File Server
An Administrator account on both PC's
Step 2: Let's Begin!!
Okay, so you have everything you need.
First, on the Windows 7 Computer, click Control Panel - Network and Internet - Network and Sharing Center - Advanced Sharing Settings
Once in there, Enable the following:
Turn On File And Printer Sharing
Turn On Password Protected Sharing
Enable sharing with devices that use 40- or 56-bit encryption
Step 3: Further Steps
If the last step fixed file sharing for you, then you're finished!!
If not, then you're in the same position I was :(
You need to make sure the user name you are entering to log into the computer has a password, then enter that same password into the login box. I use the Administrator account because it is hidden. This is kind of bad practice, but it works to show the principle
Step 4: The End
I hope that this is a happy ending for you all. Happy fixing :)