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Avast's big claim to fame is having boot-time features built in, where you can simply select scanning before Windows boots up.

https://support.avast.com/en-in/article/132/

Nice to "see" you again too, Druggas :) Frankly. I'm surprised that I can still access my account :p

Since the system is so slow that you can't get anything done *in Windows*, I would recommend trying a boot time rescue CD:

https://www.avira.com/en/download/product/avira-rescue-system

Many AV...