These are instructions from Microsoft.
I include them here only because it can be frustrating
to find them at Microsoft when needed.

1.Start Internet Explorer (if it is not already started).
2.Empty the contents of the Temporary Internet Files folder.
To do so:
a. On the Tools menu, click Internet Options.
b. Click the General tab.
c. Under Temporary Internet files, click Delete Files.
d. When you are prompted to delete all temporary Internet files, click OK.

3.In the Downloaded Program Files folder on your hard disk,
remove the files that are listed as either Unknown or Damaged.
To do so:
a. On the Tools menu, click Internet Options.
b. Click the General tab.
c. Under Temporary Internet files, click Settings.
d. Click View Objects. The list of program files that are downloaded
to the SystemRoot\Downloaded Program Files folder on your hard disk
appears in the Downloaded Program Files window.
e. In the Status column, note the files that are listed as either
Unknown or Damaged. Remove these files.
To do so, right-click the file, and then click Remove.
f. When you are prompted to confirm the removal, click Yes.
g. Close the Downloaded Program Files window, and then click OK two times.

4.Save an image in Internet Explorer to test and determine if the issue is
resolved.


If the issue continues to occur after you remove all downloaded program files
that are listed as Unknown or Damaged, try removing the other
downloaded program files that are on the list.

Note: The next time that you need one of the files that you removed
from the Downloaded Program Files folder, you will receive a prompt
to download the file to your hard disk in Internet Explorer.