Would you suggest to go for the OTL or Install of the Avast(Which one and will I be able to still use my current license?)

I was thinking of restoring my laptop to an earlier date. The earliest it has is 20-10-2013, I just don’t know what the roblem is and if I will just make it worse by doing that…
Please advice!

I’ve decided to go ahead with the OTL, cause it’s already Monday and this laptop is important for my daily income. The only thing is in the screenshot on the Log to assist page I see an include 64bit scans, and that I have to put a tick, but I cant seem to locate it on the OTL I just downloaded…
Do I have the right download?