As this only occurs with Adobe Acrobat X, it narrows down the cause. I have some ideas on how to fix it. Idea One
- Repair the install. To do so:
- Open Acrobat. Just do it from the start menu, don't open anything in it.
- Go to Help
- Click repair Acrobat Installation
- Follow the on screen instructions
- If this doesn't work, try uninstalling Acrobat. Use Revo Uninstaller
to get rid of all traces of the program.
Hope this helps