If you have are facing a slow system problem then you follow the below process.
1. Write run in the search bar of your windows system then write %temp% in the run search bar then automatically a file open delete it( Its a temporary file).
2. In the same run search bar write here tree then automatically CMD open and wait until all the process is not complete. (refresh file in file or folder in tree form )
3. Check the C drive it may full then make it free.
If it improves otherwise increase RAM or use SSD drive.
Not enough information about the computer. How old ? Any new hardware or software changes? Home built or brand name ? Besides being slow, any other issues? What have you attempted to do to help speed it up already ? Please provide more detail to get help here or anywhere else.
You can use this tool http://www.ccleaner.com/speccyto provide information about your computer. Once you run the application, it will generate a detailed report and will offer information that should indicate where and why your computer is slowing down. This computer application is free and safe to use .