Win32.Adware.RegDefense is a hazardous adware application that slows PC performance and leads to loss of important data. When on a machine, Win32.Adware.RegDefense will show annoying pop-up ads for adult or other objectionable websites; this can make your computer completely useless once you visit the website which includes infected programming or code. Win32.Adware.RegDefense can block you from accessing a hard disk. Win32.Adware.RegDefense might be able to record and reset your account settings or change your default homepage to a different one, which sometimes cannot be changed back. Also, Win32.Adware.RegDefense can also add new desktop items or toolbars to the web browser without your knowledge. It is highly advised to rid your PC system of Win32.Adware.RegDefense.