itunes not working anymore.

Tried upgrading and reinstalling. Application will not run.
Any help appreciated. Windows 7 Error message attached.
Thank you

Log Name: Application
Source: Application Error
Date: 2/16/2011 9:23:45 AM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: tom-PC
Description:
Faulting application name: iTunes.exe, version: 10.1.2.17, time stamp: 0x4d3f51b8
Faulting module name: MSVCR80.dll_unloaded, version: 0.0.0.0, time stamp: 0x4a2752ff
Exception code: 0xc0000005
Fault offset: 0x723d29e1
Faulting process id: 0xe34
Faulting application start time: 0x01cbcde51e473686
Faulting application path: C:\Program Files (x86)\iTunes\iTunes.exe
Faulting module path: MSVCR80.dll
Report Id: 5c0b8f29-39d8-11e0-94de-005056c00008
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2011-02-16T14:23:45.000000000Z" />
<EventRecordID>11562</EventRecordID>
<Channel>Application</Channel>
<Computer>tom-PC</Computer>
<Security />
</System>
<EventData>
<Data>iTunes.exe</Data>
<Data>10.1.2.17</Data>
<Data>4d3f51b8</Data>
<Data>MSVCR80.dll_unloaded</Data>
<Data>0.0.0.0</Data>
<Data>4a2752ff</Data>
<Data>c0000005</Data>
<Data>723d29e1</Data>
<Data>e34</Data>
<Data>01cbcde51e473686</Data>
<Data>C:\Program Files (x86)\iTunes\iTunes.exe</Data>
<Data>MSVCR80.dll</Data>
<Data>5c0b8f29-39d8-11e0-94de-005056c00008</Data>
</EventData>
</Event>