Watch out for a pop up saying AVG has stopped working

Hello Suzanne,
We apologize to hear about the inconvenience caused. Please note that no Anti Virus product is capable of providing you with 100% protection although AVG are always working 24/7. The infection you mentioned is an adware which could be a new variant AVG is not aware of. Please have a look at the steps in this article once http://support.avg.com/SupportArticleView?urlname=What-to-do-when-I-suspect-an-undetected-file-is-infected . Thank you.

Dear all, a pop up appeared at the bottom left of my screen a couple of weeks ago, saying that AVG had stopped working, or words to that effect.  I clicked it to get more info.  This seems to have been a mistake - the PUM.Optional.Proxyhijacker virus arrived on my computer, and created several problems, though I didn't realise it until later.
.  
Immediately after clicking the pop up I realised I should have first checked AVG, and it was apparently working fine - everything protected.  I have the paid version of AVG.  Why did AVG not pick up this virus?  I've now downloaded other protection as well - Malware Bytes identified and isolated the virus.

Suzanne, Also if you're using Malwarebytes make sure it's the free version. The 'paid for' version can conflict with AVG. Have a look @ this AVG article (http://avgclick.me/ConflictingApps).
AVG Guru

Hello Suzanne,
We apologize to hear about the inconvenience caused. Please note that no Anti Virus product is capable of providing you with 100% protection although AVG are always working 24/7. The infection you mentioned is an adware which could be a new variant AVG is not aware of. Please have a look at the steps in this article once http://support.avg.com/SupportArticleView?urlname=What-to-do-when-I-suspect-an-undetected-file-is-infected . Thank you.