Well, excluding those three folders didn't help. Diagnostics shows all tests passed. Here's at least some of the output:
Microsoft Windows Vista Home Premium Edition Service Pack 2 (Build 6002)
HP-Pavilion GN566AA-ABA s3200n
iTunes 11.1.2.32
QuickTime not available
FairPlay 2.5.16
Apple Application Support 2.3.6
iPod Updater Library 11.1f5
CD Driver 2.2.3.0
CD Driver DLL 2.1.3.1
Apple Mobile Device 7.0.0.117
Apple Mobile Device Driver 1.64.0.0
Bonjour 3.0.0.10 (333.10)
Gracenote SDK 1.9.6.502
Gracenote MusicID 1.9.6.115
Gracenote Submit 1.9.6.143
Gracenote DSP 1.9.6.45
iTunes Serial Number 001CB9900C54D370
Current user is an administrator.
The current local date and time is 2013-11-01 22:28:44.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is not supported.
Core Media is supported.
Video Display Information
NVIDIA, NVIDIA GeForce 6150SE nForce 430
**** External Plug-ins Information ****
No external plug-ins installed.
Genius ID: 1b0b8be42965a9e26ebeaa68670c44a1
iPodService 11.1.2.32 is currently running.
iTunesHelper 11.1.2.32 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name: {AAAB9AD5-2C13-4056-A6BF-932AD6BA9AA8}
Description: Linksys WUSB600N Wireless-N USB Adapter with Dual-Band ver. 2 #7
IP Address: 192.168.1.135
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.3
DHCP Enabled: Yes
DHCP Server: 192.168.1.3
Lease Obtained: Fri Nov 01 20:53:10 2013
Lease Expires: Sat Nov 02 20:53:10 2013
DNS Servers: 192.168.1.3
Adapter Name: {4AB21358-B990-4BAF-B750-A96083DD64AA}
Description: USB Wireless 802.11 b/g Adaptor
IP Address: 192.168.1.103
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.3
DHCP Enabled: Yes
DHCP Server: 192.168.1.3
Lease Obtained: Fri Nov 01 20:53:08 2013
Lease Expires: Sat Nov 02 20:53:08 2013
DNS Servers: 192.168.1.3
Adapter Name: {726C8E1F-862D-4214-8817-119FF99FCF41}
Description: NVIDIA nForce 10/100 Mbps Ethernet
IP Address: 192.168.1.100
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.3
DHCP Enabled: Yes
DHCP Server: 192.168.1.3
Lease Obtained: Fri Nov 01 20:53:05 2013
Lease Expires: Sat Nov 02 20:53:05 2013
DNS Servers: 192.168.1.3
Active Connection: LAN Connection
Connected: Yes
Online: Yes
Using Modem: No
Using LAN: Yes
Using Proxy: No
Firewall Information
Windows Firewall is on.
iTunes is enabled in Windows Firewall.
Connection attempt to Apple web site was successful.
Connection attempt to browsing iTunes Store was successful.
Connection attempt to purchasing from iTunes Store was successful.
Connection attempt to iPhone activation server was successful.
Connection attempt to firmware update server was successful.
Connection attempt to Gracenote server was successful.
Last successful iTunes Store access was 2013-11-01 22:27:54.
