ITunes Get Artwork: "Artwork for [album name] cannot be found. You do not have permission to access the requested resource."

Question

I just installed iTunes 10.5 (latest version as of 11 Jan 2012), onto a computer running Windows 7 Ultimate x64.  I loaded my music library into it, it compiled the list and separated them by album.  But even though I'd assigned most of the albums artwork through my Zune management software (a Microsoft product), almost none of them populated into iTunes.  So I went through and started asking the software to try to find album artwork where possible.
I did this a few times album by album, then I decided to select multiple albums and see what happened.  No problems.  Then I selected all of the albums I had--about 600 in all--and asked it to get artwork.  It seemed to process for a bit, then came back with the error, "Artwork for [album name] could not be located.  You do not have permission to access the requested resource."  I tried this on several individual albums, only to receive that same error.
The very first time I did it, I was told I needed an account with the iTunes store to make it work, so I signed in using an old Apple ID (the account had been inactive for so long it had been locked for security, I unlocked it and that seemed to be that).  Then I did what I described above.
The weird thing--to me--is that I can still add artwork to the albums manually if I want to, from imagery stored locally on my own computer.  The only thing it seems to have a problem with is when I ask it to go find artwork from the iTunes store.
Do I need to uninstall iTunes and then reinstall it?  Did something go wrong with the process of authorizing the computer to work with the iTunes store?  Do I need to de-authorize and then re-authorize the computer?  Could this be something related to Windows permissions on the iTunes library?

Answer 1

Right on about how to reset the warnings, it was exactly that.
I went through the steps to let iTunes through Windows Firewall, but still get the same problem when I access the iTunes store (and even though I followed the steps in the help file to the letter, I notice it still says iTunes is NOT enabled for it).  And now, thanks to the re-enabled warnings, when I try to get it to download artwork for single albums, this is what I get:
"Artwork for [album name] could not be found.  An unknown error occurred (-50)."
New results from the diagnostics too:
  Microsoft Windows 7 x64 Ultimate Edition Service Pack 1 (Build 7601)
Acer Aspire 8930
iTunes 10.5.2.11
QuickTime 7.7.1
FairPlay 1.13.37
Apple Application Support 2.1.6
iPod Updater Library 10.0d2
CD Driver 2.2.0.1
CD Driver DLL 2.1.1.1
Apple Mobile Device 4.0.0.97
Apple Mobile Device Driver 1.57.0.0
Bonjour 3.0.0.10 (333.10)
Gracenote SDK 1.9.5.502
Gracenote MusicID 1.9.5.115
Gracenote Submit 1.9.5.143
Gracenote DSP 1.9.5.45
iTunes Serial Number 0034AA84038F17E0
Current user is an administrator.
The current local date and time is 2012-01-13 09:21:52.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is supported.
Core Media is supported.
Video Display Information
NVIDIA, NVIDIA GeForce 9700M GT
**** External Plug-ins Information ****
No external plug-ins installed.
The drive Q: SEMC CD-ROM Rev 0001 is a USB 1 device.
iPodService 10.5.2.11 (x64) is currently running.
iTunesHelper 10.5.2.11 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name: {403AFC2C-1FCE-43B2-B9E8-D414B29FF5D1}
Description: Intel(R) WiFi Link 5100 AGN
IP Address: 10.100.3.244
Subnet Mask: 255.255.248.0
Default Gateway: 10.100.0.1
DHCP Enabled: Yes
DHCP Server: 10.100.0.1
Lease Obtained: Fri Jan 13 09:00:56 2012
Lease Expires: Sat Jan 14 09:00:56 2012
DNS Servers: 202.174.158.10
8.8.8.8
Adapter Name: {B50EA825-FB09-459D-8855-77E5A43E18B1}
Description: Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller
IP Address: 0.0.0.0
Subnet Mask: 0.0.0.0
Default Gateway: 0.0.0.0
DHCP Enabled: Yes
DHCP Server:
Lease Obtained: Thu Jan 01 04:30:00 1970
Lease Expires: Thu Jan 01 04:30:00 1970
DNS Servers:
Active Connection: LAN Connection
Connected: Yes
Online: Yes
Using Modem: No
Using LAN: Yes
Using Proxy: No
SSL 3.0 Support: Enabled
TLS 1.0 Support: Enabled
Firewall Information
Windows Firewall is on.
iTunes is NOT enabled in Windows Firewall.
Connection attempt to Apple web site was successful.
Basic connection to the store failed.
An unknown error occurred (-50).
Connection attempt to Gracenote server was successful.
Last successful iTunes Store access was 2012-01-12 07:09:14.