The answer to this question has to do with what is wrong with your computer.
In most instances, slow running computers can be fixed by using a registry repair software.
The Windows registry is full of all kinds of obsolete information, data, files, and folders.
Every time you install or uninstall anything in your computer, you are changing the registry.
After awhile, the registry is full of all these things that you no longer use and must sort through all these items in order to find the up to date information you desire.
If you look at the registry in this manner, you will understand.
Instead of throwing out all the clothing you have purchased over the years, you place them in a box.
The problem is that newer items you purchase are at the bottom of the box.
When you look for something to wear, you must go through all different years of clothing to find the outfit appropriate for today.
This is what your computer does as it weeds through all the outdated files and folders to find the current information it needs to run.
Just as you would go through that box of clothes and throw away the out of style clothing, a registry repair tool will remove all the dead files, incomplete installs, incomplete uninstalls, and all obsolete files and folders.
In the majority of cases, this is all your computer needed and will run much faster.
The job of a registry repair software is to clean out the garbage, which is bogging down your computer.
You can have all kinds of problems besides a slow computer when the registry needs cleaned including errors messages, frequent crashes, and slow boot-up times.