If you have a Windows computer (not a Mac/Apple or Linux), you are probably familiar with a handful of errors and error messages. Well, in most cases, these errors do not show up unprovoked. When they happen, however, they can be devastating, annoying, and make you wish you were using a different computer. Either way, here is a list of some of the most important Microsoft Windows files, a bit about them, and why they are important.

BootMgr – This is the Windows Boot Manager and it’s responsible for booting your system. Without this file in working order, your computer probably won’t even turn on.

Hardware Drivers – You have a lot of these on your computer. Depending on what hardware and what types of hardware you are using, you will have different drivers. The hardware drivers are responsible for allowing the software on your computer to communication properly with the hardware on your computer.

Software & System Drivers – Much like the hardware drivers to make sure the hardware on your system is working properly, you have software and system drivers too. These are vital for making sure the software applications and other necessary system elements can function correctly on your machine. Without these, you wouldn’t be able to use the applications you use. These control apps like Internet Explorer, Google Chrome, Mozilla Firefox, video games you have installed, Microsoft Word, and a variety of other applications.

Csrss.exe – This file is associated with Win32 subsystem. It’s actually the Client/Server Runtime Subsystem (that’s what csrss.exe stands for). This file is strictly required by Windows to function properly. Without this file working, your system will not work. The unfortunate part about this file is that some users get errors with it. If you do get errors, be sure to fix them as quickly as you possibly can, since your machine will fail without it.

Registry Files – These are additional files located in the backend of your computer. They help association various file locations and allow your hard drive to properly read files you want to access. Many users get registry errors and these can be detrimental to the overall integrity of your hard drive as well. Registry errors may happen if you move a file to an unspecified or unknown location.

Your computer has thousands of other files to properly execute the various processes you run every single day. If you press CTRL+ALT+DEL on your keyboard, you can see a list of the processes, programs, tasks, and other information about your system. Unless you know what you’re doing, it’s not suggested to edit, remove, or delete files from this list.

For additional information about keeping your computer in good health, watch this video about quickly and easily cleaning up files.