To uninstall Office Assistant, follow these steps:

1. Open the control panel. Type "Control Panel" in the Windows search bar and open it.

2. Select "Programs" and click "Programs and Features."

3. Find "Microsoft Office" or "Office Assistant" in the program list and click on it.

4. Click the "Uninstall" or "Change" button.

5. Follow the on-screen instructions to complete the uninstall process.

If you are using a Mac computer, please follow these steps:

1. Open Finder.

2. Click the "Go" menu in the upper left corner of the screen and select "Applications."

3. Find the "Microsoft Office" folder in the application folder.

4. Find the application named "Office Assistant", right-click it and select "Move to Trash".

5. Empty the Trash to complete the uninstallation.

Please note that uninstalling the Office Assistant may affect some functionality of the Office suite. Make sure you understand the possible consequences before uninstalling.