RegAsm.exe opening every 1 minute

It seems to be part of Net Framework, so is probably a legitimate file.
Regasm.exe (Assembly Registration Tool) | Microsoft Docs

However there is a risk malware is involved, so you should do appropriate checks.

Suggest you try
a. Safe Mode
b. A clean boot
and see if it appears in either case.
Perform a Clean Boot in Windows 10 to Troubleshoot Software Conflicts Performance Maintenance Tutorials
(part 1).
Note- you could just disable all startups and go from there.

If not, then progressively enable items you disabled for the clean boot until it reappears.
If that works out, you can identify what it relates to by a process or elimination.

Alternatively:
a. Do you have a System Restore point you can use created before this started happening?
b. Do you have a disk image created before this started happening? We constantly recommend people use disk imaging routinely as it means users can often restore their disk or PC to a previous good state quickly and without technical help. E.g. Macrium Reflect (free).