"Failed-Virus scan failed" error when making downloads on chrome

Can you boot in safe mode and try downloading the suggested files? If you have access to another machine, download the Kaspersky rescue disk here:

Kaspersky Rescue Disk 10

Follow the instruction for burning the ISO to CD or USB stick and boot your system to the rescue disk with internet access. Perform a full scan, after the AV definition has been updated.

I was plagued w/ this same download problem in Chrome, but also in IE and FireFox too. Tried everything. Nothing worked until I did a thorough AVG2013 uninstall including AVG in my Start Menu, registry keys, Program Files AVG directory folder removal, etc. And voila, the downloads keep on coming!

Thinking back, this whole Win7 DL problem started when upgraded to the new AVG2013 engine. I've decided to go w/ Avast! free version for my anti-virus protection.

Just to check, could OP please see if he/she can open 'windows defender' on the mention computer.

Actually I had the same problem. All browsers delete files after downloading them. I read, after searching, somewhere that the browsers are trying to use Windows Defender to scan the file, but Defender was missing from the system. So I checked my computer, and could not launch Defender and the icon was broken.

I copied the Defender folder from another PC, which could download fine. This fixed the problem with the downloading. Now the browsers do not show any error.

But on launching Defender now, even though the downloading is fixed, Defender says : Service is stopped. When I click 'Start Now', it says : "The specified service does not exist as an installed service.". I cannot turn on 'Windows Security center service' from the Action Center either. It is missing from Services.msc.

Is all this because of the above mentioned "Zero access virus" or could it be some windows update / installation bug?

Also, sfc /scannow stopped at 91% saying 'could not complete'. sfcdetails.txt was clean!!. sfc/ verifyonly found 'integrity violations', but again sfcdetails.txt did not show anything of help.

my computer was giving the same virus scan error after some researching i figured it out so wat u wanna do is download rkill and mbam from the link in description from someones computer any relatives or neighbours computer in my case i have laptop as alternate first start computer in safe mode with networking if u want by pressing f8 on startup then run rkill.exe after that the icons on desktop will disappear and after a few minutes or seconds a notepad will popup well in my case it did popup then close notepad if didn't appear but icons returned back to normal then run mbam full full system check after its done exit safe mode and boot in active mode and again run mbam for those programs that didn't run after that reboot your computer and..........voila ur computer is now fixed and sorry for my bad english i am just 13 years old............................................................ here are the links.........
For rkill.exe
http://download.bleepingcomputer.com/grinler/rkill.exe
For Mbam
http://www.myantispyware.com/mbam
For windows 8 users get the tutorial here :-
How to start Windows 8 in Safe Mode
these are direct download links thanks plz reply if it did help...................

If is zero access virus, try Rogue Killer, it solved my problem.

I used trial version malware software solved it once last time, but the same problem returned after the malware software expired and I uninstalled it...

I figured out that I able to download it using bit Comet which I installed before I get the virus.