Question Mail app/Chrome opens at random and minimises whatever is running

[ArchithC137]

Sorry about the long post, this issue has been disrupting my work for a few days and i'm desperate for a fix.

This issue started 4 days ago out of the blue. The stock mail app would open itself at random, sometimes at right after start-up sometimes maybe an hour after start-up, like I said totally random. After I close it sometimes it takes some time to pop up again and sometimes it pops back up right away.
I uninstalled the app using win powershell and then chrome started behaving in the same manner. Uninstalled chrome and this "You are trying to open a file of type 'system file' (.dll)" message keeps popping up.
I haven't made any changes to the system before this issue started, it just started totally out of the blue.
I contacted Microsoft helpline 4 different times and 4 different tried 4 different fixes -

1. Created a new user account
2. Performed something similar to a clean boot to stop chrome from starting up and stuff
3. Downloaded and installed a Win 10 repair because he suspected the OS is corrupt
4. Did a full reset

After the reset I straight away uninstalled the mail app and didn't download chrome either. It was okay for a few hours but then the error message started popping up again.

I have run Kaspersky and Malwarebytes. Also a lot of other free malware detectors posted on some forums but none have found out the root of the problem.
Im hoping that I get a definite fix here :/

 

[wpgwpg]

If this happened to me, I'd restore from a recent full system backup I've made. If you have no backup, you may end up having to save your data and then do a clean install. Before doing that I'd check for corrupt files by opening an administrative command prompt and issuing these two commands:
SFC /scannow
DISM /Online /Cleanup-Image /RestoreHealth

 

[ArchithC137]

If this happened to me, I'd restore from a recent full system backup I've made. If you have no backup, you may end up having to save your data and then do a clean install. Before doing that I'd check for corrupt files by opening an administrative command prompt and issuing these two commands:
SFC /scannow
DISM /Online /Cleanup-Image /RestoreHealth

I ran both and its still happening :/
How can I perform a clean install? You don't mean reset and installing windows do you?