Many of us spend many hours daily in front of the computer, and most of this time is related to browsing the Internet. As we always need our PCs, we need them to be protected, safe from the wide variety of threats that exist out there. Many people when browsing the Internet might encounter some kind of Trojans. Messages saying your computer has been infected will be displayed on your screen. They will mostly say your PC needs better protection and you should install a given program you're being told about. Once done, you will quickly discover the program is not working as expected at all. There are many infections that get into the operating system this way and PC Defender is one of them, being a typical rogue anti spyware application. Double check here Remove PC Defender has pertinent infos about this threat.
A totally fake system scan of your PC will start soon after your PC has been infected. Then you will be asked to buy a full online (and fake) version of this program claiming it will clean your PC. Many PC users will indeed buy this fake full version. They are but losing their money. This rogue program will during the scanning process do 2 main things: create new files (fake ones) and delete some very good files being used by windows. Go here Remote Computer Repair is an online service to clean your PC from threats.
PC Defender also modifies the settings of your browser and constantly monitors your activity on the Internet. The consequences include the regular display of pop ups and ads, but they do not limit to this two complications. It will also redirect you to others compromised websites rather than the one you were trying to browse. This kind of program is also used by some bad companies trying to sell you their own products/services. Over time, if you don't clean this rogueware, your PC will get infected with more malware and as a whole, it will perform very poorly.
When you identify the presence of PC Defender on the computer, you have to find a way and remove it immediately. First, you can try to remove it using some automated program. Or you can try to remove it manually, then be sure to have a backup of your system before starting.