Cannot Open Extend.dat

[prsnrs]

Upon opening Outlook 2007, I received the following error - "Cannot open file extend.dat." Apparently, one solutioins is to change that file to extend.old. When I tried that fix I received another message that I didn't have the proper administrative authority. I am the Administrator and no one else uses my computer. Why can't I change this folder. BTW, after restarting my computer yet again, the first error message was gone. What gives?

Thanks.

PRS

 

[osholt]

Hi, there are a couple of things you can try:

Take Ownership of that file, a tutorial on how to do so is at Take Ownership of file - Vista Forums.

Do a System Restore, the tutorial can be found at System Restore - Windows 7 Forums.

These should be a good place to start.

Oli