Ok. So I recently got help to remove this, but not from avast! fourms. I recently uninstalled chrome because it would send me these notifications of the link thats been blocked. I assumed it was something to do with chrome but I am using firefox and the alert just popped up. please help.
Attach your basic logs. (MBAM, FRST and aswMBR…!!)
Instructions: https://forum.avast.com/index.php?topic=53253.0
heres mbam
We need these logs only to begin with for the malware specialist to review. Please refer to the link posted, read the directions, and post those logs only. Thank you.
farbar logs and aswMBR log
Does this occur in IE as well, also does it appear on sites with a video ad
CAUTION : This fix is only valid for this specific machine, using it on another may break your computer
Open notepad and copy/paste the text in the quotebox below into it:
CMD: bitsadmin /reset /allusers CMD: DEL %TEMP%\*.* /F /S /Q CMD: RD /S /Q %TEMP% REBOOT:
Save this as fixlist.txt, in the same location as FRST.exe
Run FRST and press Fix
On completion a log will be generated please post that
Please download AdwCleaner by Xplode onto your desktop.
[*]Close all open programs and internet browsers.
[*]Double click on AdwCleaner.exe to run the tool.
[*]Click on Scan.
[*]After the scan is complete click on “Clean”
[*]Confirm each time with Ok.
[*]Your computer will be rebooted automatically. A text file will open after the restart.
[*]Please post the content of that logfile with your next answer.
[*]You can find the logfile at C:\AdwCleaner[S1].txt as well.
I don’t know about IE, seeing as I haven’t attempted to use it yet. But the odd thing it the notification only happens every now and then it isnt a constant alert, could it be some infected websites? I went to answers.com and it popped up
here are the logs
I must admit I am leaning towards poisoned ads as most of the others are reporting it on odd sites not every one, which leads me to assess as an outside agency rather that something on your system
thank you so much for your help
This has now been confirmed by Avast as a false positive 
Subject to no further problems
I will remove my tools now and give some recommendations, but, I would like you to run for 24 hours or so and come back if you have any problems
Now the best part of the day ----- Your log now appears clean 
A good workman always cleans up after himself so…The following will implement some cleanup procedures as well as reset System Restore points:
Download and run Delfix
https://dl.dropboxusercontent.com/u/73555776/delfix.JPG
: Keep Java Updated :
WARNING: Java is the #1 exploited program at this time. The Department of Homeland Security recommends that computer users disable Java
See this article
I would recommend that you completely uninstall Java unless you need it to run an important software.
In that instance I would recommend that you disable Java in your browsers until you need it for that software and then enable it. (See How to diasble Java in your web browser and How to unplug Java from the browser)
Now that you are clean, to help protect your computer in the future I recommend that you get the following free programmes:
CryptoPrevent install this programme to lock down and prevent crypto ransome ware
https://dl.dropboxusercontent.com/u/73555776/CryptoPrevent.JPG
Update and run weekly to keep your system clean
It is critical to have both a firewall and anti virus to protect your system and to keep them updated.
To learn more about how to protect yourself while on the internet read this little guide Best security practices Keep safe 