The Web is full of stories from people who have run a registry cleaner and encountered problems. Because there are so many registry entries to go through, this program may sometimes also remove useful registry entries, causing you problems. One System Care scan your registry for these outdated entries and offer to remove them. Some of the entries may be slightly outdated - maybe you’ve uninstalled a program and it left a key or two behind, or maybe a there’s a file extension with no associated application. It contains hundreds of thousands of entries. The Windows registry is a database that Windows and its applications store their settings in. Unfortunately, some free downloads do not adequately disclose that other software will also be installed and you may find that you have installed adware without your knowledge. One System Care is bundled with other free software that you download off of the Internet. However, if you try to fix these issues, One System Care will state that you need to buy the full version before being able to do so. One System Care is a potentially unwanted program, which is advertised as a system optimizer, and once installed it claims that several issues were been detected on your computer.