I have recommendations for specific security software and techniques in various places on the site. Here’s a short summary.
A redirect virus can fool your browser into going to malicious web sites without your knowledge. I’ll outline my experience detecting and removing one.
Download sites are just too risky these days – unless there is no way to avoid them. Even then, be very careful in your selections.
Temp files that you can’t delete are often safe. Still, I am concerned that one of your files sounds like it’s related to known malware. The first step is to clean up.
This file could be anything. I’ll show you how to track this file down and do a cleanup – just to be sure that it’s not malware.
Even the best anti-virus and anti-spyware tools miss things. Malwarebytes Anti-malware has a good reputation for cleaning up some of the things that other tools don’t.