Itunes match stops Itunes from working on a windows 7 64 bit PC

Question

Microsoft Windows 7 x64 Ultimate Edition (Build 7600)
Dell Inc. Studio XPS 9100
iTunes 11.1.3.8
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 1.63.0.0
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 00DCBC201208EEA8
Current user is not an administrator.
The current local date and time is 2014-01-09 08:19:31.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is supported.
Core Media is supported.
Video Display Information
ATI Technologies Inc., AMD RADEON HD 6670
**** External Plug-ins Information ****
No external plug-ins installed.
Genius ID: ce06aa4a18a321df2eefb3c779bf1239
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name:           {F0B5354E-8EA6-45CE-B27E-B80027B7F62B}
Description:                 DW1525 (802.11n) WLAN PCIe Card
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:         Wed Dec 31 18:00:00 1969
Lease Expires:           Wed Dec 31 18:00:00 1969
DNS Servers:             
Adapter Name:           {7CA2450F-3522-4C73-B0C8-FF6853F09CF8}
Description:                 Realtek PCIe GBE Family Controller
IP Address:                 192.168.1.100
Subnet Mask:             255.255.255.0
Default Gateway:       192.168.1.1
DHCP Enabled:          Yes
DHCP Server:             192.168.1.1
Lease Obtained:         Wed Jan 08 23:57:05 2014
Lease Expires:           Thu Jan 09 23:57:05 2014
DNS Servers:              192.168.1.1
                                        75.75.75.75
                                        75.75.76.76
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 NOT 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 2014-01-09 08:17:30.
**** CD/DVD Drive Tests ****
LowerFilters: PxHlpa64 (3.1.1.0),
UpperFilters: GEARAspiWDM (2.2.3.0),
D: PLDS DVDRWBD DH-12E3S, Rev MD11
Drive is empty.
Error Correction is turned on for importing audio CDs.
**** Device Connectivity Tests ****
iPodService 11.1.3.8 (x64) is currently running.
iTunesHelper 11.1.3.8 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
Universal Serial Bus Controllers:
NEC Electronics USB 3.0 Host Controller.  Device is working properly.
Intel(R) ICH10 Family USB Universal Host Controller - 3A34. Device is working properly.
Intel(R) ICH10 Family USB Universal Host Controller - 3A35. Device is working properly.
Intel(R) ICH10 Family USB Universal Host Controller - 3A36. Device is working properly.
Intel(R) ICH10 Family USB Universal Host Controller - 3A37. Device is working properly.
Intel(R) ICH10 Family USB Universal Host Controller - 3A38. Device is working properly.
Intel(R) ICH10 Family USB Universal Host Controller - 3A39. Device is working properly.
Intel(R) ICH10 Family USB Enhanced Host Controller - 3A3A. Device is working properly.
Intel(R) ICH10 Family USB Enhanced Host Controller - 3A3C. Device is working properly.
FireWire (IEEE 1394) Host Controllers:
Texas Instruments 1394 OHCI Compliant Host Controller.  Device is working properly.
Most Recent Devices Not Currently Connected:
iPod touch (3rd generation) running firmware version 5.1.1
Serial Number:            1B004BB66K2
**** Device Sync Tests ****
No iPod, iPhone, or iPad found.

Answer 1

@Merel, I find it amusing that people have hundreds of blocked senders. I have been using internet mail since late 1980s. I have been actively using some of my mail accounts since before the Millennium. I have no blocked senders.
I used to have blocked senders in MSN messenger and Yahoo messenger as it was the only SPAM control option available, but I have Zero blocked senders in my mail client. I certainly get loads of spam in my Yahoo account, it is something Yahoo appear to be incapable of managing. I get very very little in my other mail accounts, so other providers can mange it.
Thunderbird does an excellent job of managing my spam with only a few each day making it to my inbox.
You appear to think transferring this list from client to client is important. I would really like you to tell me why! Then I would love an explanation why you think syncing of such list has merit.
Most people with lots of blocked senders appear to think a blocklist is a SPAM management tool. It is not.
Either they are using blocked senders for SPAM control, something that is simply not appropriate as it is a slow process. To place each mail in a list and check it against 500 email addresses you don't like simply bogs down the receipt of mail.
Or they are and a particularly unlikable person that just