I've been trying to install the latest version of Skype and it installs OK but when I do a restart it stops working. This is from the Administrative event log. I ran sfc /scannow and all is OK. Windows 7 Pro 64 bit

Log Name: Application
Source: Application Error
Date: 1/31/2011 8:57:35 AM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: Richard
Description:
Faulting application name: Skype.exe, version: 5.1.0.104, time stamp: 0x4d21d204
Faulting module name: ntdll.dll, version: 6.1.7600.16559, time stamp: 0x4ba9b29c
Exception code: 0xc0000005
Fault offset: 0x00042349
Faulting process id: 0x86c
Faulting application start time: 0x01cbc15707691120
Faulting application path: C:\Program Files (x86)\Skype\Phone\Skype.exe
Faulting module path: C:\Windows\SysWOW64\ntdll.dll
Report Id: 6fddb215-2d4a-11e0-b3b3-0026181a555a
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="2011-01-31T14:57:35.000000000Z" />
<EventRecordID>25767</EventRecordID>
<Channel>Application</Channel>
<Computer>Richard</Computer>
<Security />
</System>
<EventData>
<Data>Skype.exe</Data>
<Data>5.1.0.104</Data>
<Data>4d21d204</Data>
<Data>ntdll.dll</Data>
<Data>6.1.7600.16559</Data>
<Data>4ba9b29c</Data>
<Data>c0000005</Data>
<Data>00042349</Data>
<Data>86c</Data>
<Data>01cbc15707691120</Data>
<Data>C:\Program Files (x86)\Skype\Phone\Skype.exe</Data>
<Data>C:\Windows\SysWOW64\ntdll.dll</Data>
<Data>6fddb215-2d4a-11e0-b3b3-0026181a555a</Data>
</EventData>
</Event>
It says the faulting module is the ntdll.dll