Windows is like a well-oiled machine.
If all the gears are optimized in the best possible way, then the whole system is going to run fast and do the things you want it to in the quickest time possible.
The problems arise when those gears start to get rusty...
when some parts of your system start to not run so fast or smoothly.
The largest and most important component of Windows is the "registry database" which is the core storage facility of all the settings and options of your computer.
Everything from your desktop wallpaper to your computer's time is saved here and Windows cannot operate without it.
So if you're computer is going slow, the chances are that it's because this registry database is either corrupted or damaged in some way, which is VERY common.
You see, when you use your PC, the registry is constantly being accessed.
Even when you're just browsing the Internet (like now), Windows is frantically adding and updating files in the registry database in order to make your computer run smoothly.
Because 1,000's of these files are being transferred, the door is left wide open for some of them to get deleted or corrupted.
You can actually fix this pretty easily with a software tool known as a "registry cleaner".
This type of software scans through the registry database and fixes / replaces all the damaged and corrupted files to make your computer run fast again.
It's as if the damaged files are causing a blockage in your computer and the registry cleaner is going to fix it for you automatically.