Mshta.exe in the your location is looks like legitimate file.
But it is often used by malware.
I can make you a free check of your PC:
Open UnHackMe.
Click the "Help in Removal" button on the main screen.
Choose "Send Log File to Support Center."
Enter your e-mail, name, or nick.
Describe your problem.
Accept our Privacy Policy.
Click the "Upload" button.
If you have any trouble with it, you can manually attach "regrunlog.txt" from your desktop and send it to us by e-mail at support@greatis.com.
I will check your log and send you a solution as soon as possible.
Video lesson: https://greatis.com/send-unhackme-log