trojan downloader win32/renos.io

Hi My windows defender is saying that i am infected with trojandownloader:win32/renos.io on Windows Vista I tried to remove it but it is popping up again. Since then my internet explorer and firfox are both working in a weird manner. I don't know where to start and how to get the logs. Can someone please help me on a step by step process? Thanks!

Take a read through this and then start a fresh thread in this forum and post a HJT log, and a brief description of your problem, and somebody will be along as soon as.
Helpers look for posts with zero replies which is why you need to start afresh and why i'll lock this one.