Yesterday I watched a series on web page named www.watchseries.eu and after finishing the series, every 20-30 minutes my avast security sistem keeps popping up with information such as: Malware was blocked from a certain web page (different web adresses everytime), this time your system has stopped it, your system is safe. It happens when the internet is on and off, and thereis no way for me to trace the thread of those viruses. While scanning the computer, there were no viruses found…What do I do? How do I stop this?

Obviously you know nothing about computers or the Internet…
Thank the good people at Avast for protecting you.
It means that you are about to collect a malware (virus) infection from a website you visited…
Do this:
Go tohttp://www.mywot.com/
and install the WOT (Web Of Trust) add-on tool to your browser.
WOT will rate all websites and web searches and alert you when you are about to access an untrusted website, also preventing you from doing so.
Also, DO NOT USE IE (Internet Explorer), it is the worst web browser ever.
Install and use Firefox or Google Chrome (with WOT)
EDIT:
@Yahoo4life:
Windows Defender is crap, just like anything else Microsoft makes. Also it is not an antivirus…
Avast is the best free antivirus.
Avast is doing its job. I got malware and it was difficult to get rid of. Be grateful.
find another virus protection to scan your computer windows defender is free from microsoft.com