How To speed up a computer

• Move your files from Drive c to D or other drives
•  Increase your RAM size 
•  Reformat your Computer it might be a viral infection is slowing it down 

SEE ALSO :How to increase your laptop battery life

• uninstall some irrelevant programs 
• empty the recycle bin 
• please revert to a much older OS you might be having OS Compatibility issue that is your PC is not able to handle the latest OS