We all know the problem, right? Your windows computer is slowing down. Sometimes not responding. Freezing, etc… It’s time to clean-up your computer a bit. Without computer knowledge you can already clean up your computer in order to make him faster again.
Here is how to clean-up your windows operating system. The 3 first steps can be done without any risks. The last ones are for advanced computer users, and may contain some risks (see colors).
1- Uninstall all unnecessary programs.
You can do this in 2 ways.
a/ Uninstall feature in the windows control panel
b/ with a specific software, like revo uninstaller (free)
-> the revo uninstaller is better because it also deletes registry keys and folders
2- Do a general cleanup (cookies, temp files, browser related stuff, …)
The best way to do so, is to use the software CCleaner which is also free. Run a full diagnosis and clean everything.
3- Antivirus, antispyware, antimalware scan
Whatever program you are using, run the fullest scan possible and clean/disinfect everything
4- Delete folders
Check all the folders in those folders for files and folders which are needed anymore:
C:\Users\User
C:\MSOCache
C:\ProgramData
C:\Program Files
5- Msconfig
Start – run – msconfig /enter
Watch the tabs services and startup. See what is starting up with your computer and which services are running. If you don’t know a service or a startup program, google is your friend.
Uncheck all you do not use or do not need.
6- Registry
Be carefull with this step, you are about to clean your registry.
Make a backup before proceeding.
Go to those keys and delete anything you do not need any more:
HKEY_CURRENT_USER\Software
HKEY_LOCAL_MACHINE\Software
7- Hijackthis
Your computer should be clean now. To check it, launch a program called hijackthis. He will give you a log. Check avery single line if what is written is indeed needed.
8- Sysinternals
There are other tools to monitor the registry or running processes, like processmonitor and processexplorer from sysinternals.
If you know some more tools or clean up ways, leave a comment 
