Computer is infected by a virus or a malware, what do I do now?
I believe I have a virus and the virus scanning tools I tried so far haven't found any (I will continue to run them in the meantime). However, how do I manually find and remove a virus?
My first steps were to look at msconfig startup and services. I found nothing suspicious (all but one app (Launchy, which is a incredibly convenient tool) were signed. All my services are signed as well.
Why I believe i have a 'virus' is that randomly I will get a privileged prompt to run
install 1 and immediately after I hit "No" it will prompt again for
install 2. When I boot up I use 3GB of RAM. When I look at task manager and look at the memory size of the apps it adds up to 1.4GB of RAM. When I log out/in I am using the 1.3 or 1.4 GB of RAM as normal. I sometimes see my CPU usage being eaten by 'cmd'. I have no idea what process ran it.
How do I find and remove this virus manually? The symptoms above should give you some ideas of where to start when tracking and removing the virus.
Unless the virus hijacked a chrome update, I do not believe I hit "Yes" for a privileged prompt to get it onto my machine, but it doesn't make sense that it could run on startup if I have never done that.