I called Ziggo right after reading the email and had told them that it could've been because of what happened, however the person I had on the phone was one of those dull call receivers, I told him that if he could check those dates that he would probably see that the spamming has now stopped, he never mentioned anything about IP addresses (it blew my mind completely as well until after the call), he couldn't give me any information whatever except for what I've just written: that it was merely a warning and that in worse cases the connection will be cut and that if I don't receive any more warnings that the problem was solved, I asked him if this was about only spam email and he answered yes, it wasn't about malware or anything (it wasn't about child porn lol I asked him about that)
I'm going to run spybot on this computer first, tommorow I'll do another full system scan with both Avast and Spybot on our other computer
edit:
there is however one thing I have discovered with firefox, the scan is still running so far no hits
but on google sometimes when I go to one of the listed pages after searching I get redirected to some random add page, I've had this several times before this weekend and right now it happened again I searched Avast email scanner and pressed the first link to their faq ont heir website and I got redirected to some "win a BMW car!" website
if I go back and press ont he link I get redirected to a google website something about
www.google.nl/undefined and if I then go back again and click it is able to load
edit3:
Spybot indeed detected some bad entries, I deleted all of them afterwards however it started giving me the message that a registry key that was important has changed its value and if I would allow it or not, files were command.com and cmd.exe (which is for dos if I remember correctly) however the change name was so weird I ended up denying both was like letters like 20 or 25 followed by dll old which I found weird, every time I would allow it would come back again anyway