If you have registry problem for you PC or laptop ,the common registry problem might happened to your system is DLL errors. these type of DLL errors problem might occur when you frequently install and uninstall software, the software can leave some wrong uninstall entries in the registry even you have uninstalled it.

Some of the anti-virus or anti-spyware software will false report and destroy unused DLL file of some soft ware during detection. The system might detect and use the wrong version of Dll files for other programs,without the right DLL file, the program will pop up some strange message and can’t run. Note that the Control Panel "add and remove program "utilities can’t remove DLL files of soft ware.

If these DLL files stay in registry, this will cause system errors. After some time,your registry storage will full of junk files and the computer will run slowly and slowly.

What is Windows registry files
The Windows registry is a figure or database that record settings and options for Microsoft Windows operating systems. It contains information and settings for computer hardware, operating system software, most non-operating system software, and per-user settings. The registry also provides a operating system window into the operation of the kernel, exposing run time information such as performance counters and currently active hardware. Registry is so important that Microsoft suggest users not to edit it, or it will affect some functions of the system even cause system crash.