Avast crashes computer when registering

Avast Free Antivirus / Premium Security
1

When I try to activate my license avast gets most of the way through the download and then crashes my computer, at which point it freezes until I uninstall avast.
Using the uninstall tool and a clean install works, but I still can’t register. I’m running windows 7 64-bit

2
  • Which Avast…? (Free/Pro/IS/Premier)
  • Which version…?
  • Other security related software installed…?
  • Which AV(s) did you use before Avast…?
3

Avast Free trying to upgrade to Pro
2015
Spybot Search and destroy
None

4

see instructions here https://forum.avast.com/index.php?topic=53253.0
attach Malwarebytes and Farbar Recovery Scan Tool logs …in next reply here

5

First, drop Spybot…!!

Then:

  1. Download Avast Pro Antivirus: https://files.avast.com/iavs9x/avast_pro_antivirus_setup.exe
  2. Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions…!!)
  3. Reinstall Avast with the downloaded installer from point 1.
  4. Reboot.

If this doesn’t work, follow Pondus’ advice and post your logs.