If you have no backup routine, it is high time you start one. Save copies of all your computer files on a regular basis. This way, you don't have to worry about losing your files even when your computer gets infected and all files are encrypted. Get a top notch online backup program and download an anti virus protection software like Norton Security ( coupons and deals are found here ) Finally, always be on the lookout. You should neither click on strange links nor download files from individuals you do not know.