Trying to run FRST.exe, but can't get it out of SANDBOX!!

My scan today showed the same Trojan I have had, and was referred to MBAM to get help with. I disabled Avast to do scans, but FRST is running in the Sandbox, and is so slow, the scan never completed. I have gone into tools and turned sandbox off, but I can’t get rid of the Sandbox!! I have NEVER put anything in there, so can’t imagine how this happened, but can someone please tell me how to get FRST out of the Sandbox??? Well, right now it’s frozen, I was going to grab a screen shot.

I believe the is an option to ‘delete’ contents of the Sandbox in Sandbox settings

Also you can Change, add, or remove individual program components
https://www.avast.com/faq.php?article=AVKB96#artTitle