Hi,
For such abnormal behavior, we'd suggest to check 3 things first:
- 3rd-party addins
- macros
- 3rd-party services or applications
Start Word in safe mode to determine if it could be caused by 3rd-party add-ins or macros.
Hold down Ctrl key to double click on the document to open the document by starting Word in safe mode.
Hold down Shift key as well will allow you to select more documents to be opened in the same time.
If this behavior won't occur in safe mode, check whether there are any macros or 3rd-party add-ins, then use the method of elimination to find out the cause.
If this behavior still persists in safe mode, configure Windows to start in clean boot mode to determine if it could be caused by the 3rd-party services.
See how to perform a clean boot to troubleshoot a problem in Windows 7 (http://support.microsoft.com/kb/929135)
Max Meng
TechNet Community Support
