Hi PhilLondon,
Welcome to Microsoft Answers!
Usually, this issue is caused by Windows Time service corrupt. You can try to take following steps to troubleshoot this issue.
Run the following command in a elevate privileges cmd window.
net stop w32time
w32tm /unregister
w32tm /register
net start w32time
w32tm /resync
Then, please restart the computer to test the issue again.
W32tm.exe is used to configure Windows Time service settings. It can also be used to diagnose problems with the time service. W32tm.exe is the preferred command line tool for configuring, monitoring, or troubleshooting the Windows Time service.
Refer this link for more information:
http://technet.microsoft.com/en-us/library/cc773263(WS.10).aspx
You also perform System File Checker.
1. Open an elevated command prompt. To do this, click Start, click All Programs, click Accessories, right-click Command
Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a confirmation, type the
password, or click Allow.
2. Type the following command, and then press ENTER:
sfc /scannow
The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.
For further information, visit the below mentioned link:
http://support.microsoft.com/kb/929833
Hope this information helped!
Thanks and regards
Fouzan – Microsoft support
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