well i already buy this product almost 2 months but since the day i buy, i never used it because after i restart my computer it always say that cannot connect to internet, i press the refresh button but still the same !!! HELP ME !!! Maybe u can just refund my money back cause its useless… sorry for my poor english !!! 
also i already to restart my wifi but still the same, maybe just refund my money back !!! :o :o :o :o
Hi and welcome to the forum.
You can open a support ticket here: http://support.avast.com.
Explain your issue in detail and what you want.
Once submitted, give the process 7-10 working days if requesting a refund. 
This inability to connect to the internet seems to be a very common problem, yet there don’t seem to be any confirmed solutions in the forum that I could see.
Has this actually been resolved for anyone? If so, how?
I have ten PCs that are all configured differently (but all on the same Ethernet network with shared internet access) that I was going to use GrimeFighter on, but if there are no common solutions, it’s not worth pursuing ten individual support tickets that may or may not work depending on the individual specs of each PC.
I did submit a support ticket [#YVC-331-16927], but I’m not optimistic based on what I’m reading.