Ah sorry, I thought (wrongly) that solving the issue did not require a clean install. I just believed that turning self defence off again was enough.
Exactly, repairing the installation (dirty installation) did not work. I need to do a clean one (from scratch).
Two days with avast! self defence off. So far so good - no yellow exclamation marks ;D
Will you try to turn it on? 
No. At this point I don’t want to risk on stability. I think it is the case when I have to choose and stability wins over more secure PC. Yes, self protection is a good feature but it is not vital in this case, so I will wait for some updates regarding this issue and enable it then.
Hi
I have been having the same problems and I have wasted over 4 hours trying various work arounds before discovering this thread which confirmed what I think I had worked out for myself. I have now managed to get my computer working by turining the Avast Firewall off and uninstalling it (Win 8 64 bit in place upgrade from Win 7). IMHO Win 8 is pants and I won’t be upgrading any more of our computers, however, I am appalled that Avast haven’t put a fix out for this - I have the latest version of the software - this is clearly a bug in the product and a nasty one at that.
Is there any indication when a fix might be on the way?
I have Windows 7 and after updating to the new Avast! version on 11/6/12, my laptop got weird and I got that same error message “avast! Firewall NDIS Filter Miniport #219” after a driver was trying to install upon starting my laptop.
I have no problem connecting to the internet but I cannot seem to connect remotely with my work pc using SonicWALL Global VPN Client. I connect to the server but not to my actul work pc. Never had this problem before.
I have AIS and have paid for the 2-year license.
Please help…
A) Try to disable avast self defense module and restart notebook several times, until all avast! Firewall NDIS Filter Miniport entries or unknown devices will be gone from device manager.
B) If this does not helps, uninstall avast, restart, install avast, restart and disable self defense.
A or B should solve avast! Firewall NDIS Filter Miniport problem, if it’s related with your problem directly, this workaround should solve it.
Any News on this subject?