Nordbard

Hi all i have one weird problem. Up to this point i was available to download any mod for Skyrim from Nexus site without any error. But now each time i download any 7zip file from site i get data error while extracting aka files are corrupted. It doesn't matter if 7zip file is 10kb or 10gb i get that error. - I only have that error on nexus files - It wasn't like that from beginning, that error just started suddenly, i know nothing triggered it because i was aware what was being done on pc prior to it - Spent a lot of time trying to learn about that problem but i didn't find any help on forum or net because this problem is rather specific Now my question is did anyone had problem like this, what is cause and solution?