Hi,
browser thru all the tabs in standard-shield settings, and somewhere you will see a checkmark that indicates that
Deletion of files should be BLOCKED .. or some similar wording..
-> remove that checkmark -> OK
(P.S.: imapi.exe won't be mentioned there..)
if the settings don't remain,
- make sure that you are logged in as Admin
- read the USER'S FAQs in the OFF-Topic-Forum