When switching to the 32-bit version of Office after installing the 64-bit version to accommodate a plugin or some other reason, uninstalling the 64-bit version leaves behind the registry entries associated with explorer’s preview pane. Then, Office programs will generate errors like these:

Word: Word could not create the work file. Check the temp environment variable.
PowerPoint: Access denied. Contact your administrator.
Excel: This file cannot be previewed.
Outlook: Outlook could not create the work file. Check the Temp environment variable.

To resolve this, delete the following registry keys (after exporting “just in case”):

[Word Preview]
HKEY_CLASSES_ROOT\CLSID\{84F66100-FF7C-4fb4-B0C0-02CD7FB668FE}

[PowerPoint Preview]
HKEY_CLASSES_ROOT\CLSID\{65235197-874B-4A07-BDC5-E65EA825B718}

[Excel Preview]
HKEY_CLASSES_ROOT\CLSID\{00020827-0000-0000-C000-000000000046}

After deleting these keys, logoff and login. Windows will now use the preview handlers registered under the HKEY_CLASSES_ROOT\Wow6432Node\CLSID\ branch. This should fix the preview issues in Office 32-bit version running on Windows 64-bit

To enable logging of all logon/logoff attempts in the Security Event Log:

1. secpol.msc (as administrator)
2. Local Policy > Audit Policy
3. Audit account logon events policy
4. Check both the Success and Failure check boxes.