My work PC got a trojan last week. How I knew something was wrong was when I would google something and click on the link i wanted and it would redirect me to a porn site.

My droid started wigging out last week when useing gun classifieds, it will auto redirect me while browsing here, glocktalk and armslist to a website and when i go back or close it takes me to the Google play store to a game download. Now when trying to click an nra link in my email it says page not found then redirects? What the hell?