What doesn't do anything - e.g. exactly what is it that you are doing and what happens (or not) and are there any errors reported ?
I bolded it inside the quote.
Anyway, this doesn't matter anymore because Simion's method worked. I just had to configure my computer to start in safe mode manually, since F8 was not working.
Avast has been removed and I have re-installed a totally fresh copy as well as re-registering brand-new. No idea why I had to re-register brand-new, but nevertheless, it worked. So...