Cannot access iTunes store after upgrading to Windows 7 Pro x64.

Question

I recently upgraded from 32-bit Windows XP to 64-bit Windows 7 Professional by clean install (format) and re-installed iTunes for 64-bit systems. Since this upgrade, I can no longer access the iTunes store.
I can view and edit my account information and the diagnostics gives no clue.
I am using a wireless internet connection and the latest version of iTunes. If you need any other information please ask.
Any help would be much appreciated.
Microsoft Windows 7 x64 Business Edition (Build 7600)
MICRO-STAR INTERANTONAL CO.,LTD MS-7302
iTunes 9.0.3.15
QuickTime 7.6.5
FairPlay 1.6.16
Apple Application Support 1.1.0
iPod Updater Library 9.0d11
CD Driver 2.2.0.1
CD Driver DLL 2.1.1.1
Apple Mobile Device 2.6.0.32
Apple Mobile Device Driver not found.
Bonjour 1.0.6.2 (118.5)
iTunes Serial Number 90C2B1DAB5031321
Current user is an administrator.
The current local date and time is 2010-02-02 21:10:49.
iTunes is not running in safe mode.
Video Display Information
NVIDIA, NVIDIA GeForce GT 240
** External Plug-ins Information **
No external plug-ins installed.
The drive E: HUAWEI Mass Storage Rev 2.31 is a USB 1 device.
iPodService 9.0.3.15 is currently running.
iTunesHelper 9.0.3.15 is currently running.
Apple Mobile Device service 2.50.39.0 is currently running.
** Network Connectivity Tests **
Network Adapter Information
Adapter Name: {B34C1DFB-2F76-45AF-B6AB-1B426CB6B5D2}
Description: HUAWEI3G.3 Mobile Broadband
IP Address: 115.130.61.126
Subnet Mask: 255.255.255.255
Default Gateway: 0.0.0.0
DHCP Enabled: No
DHCP Server:
Lease Obtained: Thu Jan 01 11:00:00 1970
Lease Expires: Thu Jan 01 11:00:00 1970
DNS Servers: 202.124.68.182
202.124.68.182
202.124.65.22
Adapter Name: {995D78CE-E0AB-449D-8BC6-6CAE66A6A2FC}
Description: Realtek RTL8168C(P)/8111C(P) Family PCI-E Gigabit Ethernet NIC (NDIS 6.20)
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 11:00:00 1970
Lease Expires: Thu Jan 01 11:00:00 1970
DNS Servers:
Active Connection: HUAWEI3G.3 Mobile Broadband
Connected: Yes
Online: Yes
Using Modem: Yes
Using LAN: No
Using Proxy: No
SSL 3.0 Support: Enabled
TLS 1.0 Support: Enabled
Firewall Information
Windows Firewall is on.
iTunes is enabled in Windows Firewall.
Connection attempt to Apple website was successful.
Connection attempt to iTunes Store was successful.
Secure connection attempt to iTunes Store was successful.
Secure connection attempt to iPhone activation server was successful.
Last successful store access was 2010-02-02 21:06:40.
Message was edited by: joshthomas

Answer 1

Just wanted to say that I was having the same problem accessing the iTunes store. the problem was that I downloaded a PDF with a virus that masquerades as an Antivirus program, called Antivirus Soft. This thing installs itself and resets your Internet settings to its own proxy server. However, I don't use MSIE and didn't think to clear its proxy settings. I ran iTunes diagnostics and learned thet iTunes used the LAN settings from MSIE to connect to the Internet. Once I cleared the LAN settings from MSIE, I was able to connect.
SO, check your LAN settings if you're having trouble connecting but haven't received any Antivirus Soft warnings. The virus is a bear to get rid of. Any attempt to start an antivirus program is thwarted until you can get rid of the virus. You get "error messages" saying that any program you attempt to open is infected, but it isn't.I managed to get rid of Antivirus Soft by using McAfee Antivirus after a few attempt. The frustrating thing is that the viruis installs itself in your startup program, so you have to get your real antivirus running very fast after reboot.