Removal of AvastClear

I had a computer problem which necessitated my uninstalling my A/V. To be certain, I downloaded AvastClear. I did not need it to unistall Avast.

But now AvastClear is the default in my Windows Boot Manager and I don’t know how to get rid of it.

Any thoughts?

Remove it from the boot options.
How to do it depends on the OS version.

The OS version is Windows 7

Also, how do I remove it from the boot options? I tried to delete, but still there.