Hi, this is my first post here, and it's kind of a last hope.
After almost a week searching the internet and installing a lot of software still no luck.
(first of all sorry for my english, I'm from Portugal, please feel fre to correct me or ask something in any doubt)
So this is my problem:
I have a very small network installed here, 3x XP Home, 1x Win7Home, 1TB Iomega NAT, TP-LINK ADSL Router, AVAST free in all PCs.
two weeks ago all pcs got infected, suddenly new tabs start to appear with ads. (even in my android phone, when I tried to use the wi-fi network)
Tried to check task manager for suspicious processes but nothing extraordinary.
Uninstalled firefox cleared cache, reset etc... no luck.
run ccleaner, malwarebytes, hitmanpro, they all detected a few different things, apparently not very harmfull and corrected/removed, but without any change on the ads popping and laggy PCs
I have lots of logs created by the different softwares, but I guess you want the ones from the software you are used to, so I will wait for advice on it.
Apparently (surely) I may be doing a bad job, since even if I clear (doubt it) the problem in one pc, he gets infected again by the network, but I need the network to connect the internet, and all pcs are usually busy. So I guess I need to work one pc at a time. But someone said that even the router may be infected. I really don't know, hopefully you may help me, but it sure sounds a awful task for you so I am thanking you in advance for any support and understand if you can't because this is a network problem.
Best regards from Portugal.