1.Clean Your Drive
Clean up your drives by typing “cleanmgr.exe” into the run menu to access Disk Cleanup. This is that “search programs and files” box that shows when you hit the Windows Start icon, usually in the lower left of most screens (although you can move it to any part of the screen)

2. Removing malware   

Malware can also slow down your computer, running in the background and taking up system resources. To speed up your computer, install a good anti-malware product and set it to auto-update and run scheduled scans.

There are literally hundreds of good anti-malware programs available, however several stand out:

1. Auslogics Antivirus
2. Malwarebytes Anti-malware
3. Spyware Doctor

ALWAYS use a trusted name when it comes to anti-malware software. There are hundreds of rogue anti-malware programs that will actually install malware on your computer.

3. Clean Your Browser

Regardless of your browser, you should clean it out regularly. To clean Chrome, click the three bars icon in the upper right corner, then click “Tools,” then “Clean Browsing Data,” and then check the history boxes, cookies and cached items.

 Or, download CCleaner which does a great job on the five top browsers, registries and Windows, overall.

4.Add More RAM Memory

 There are a few physical things you can do to increase your performance, as well. You can and should add more RAM memory until the computer is at capacity. I’ve found that as a machine ages, you can extend its utility with a RAM upgrade. I’m literally ordering RAM for one of my laptops as I write this.

In most cases, this is simply a matter of snapping in or out memory sticks. Laptops are usually slightly more tricky and you have to remove screws, but still fairly easy. You can also have a retail store service desk do it.

5.Defrag the hard drive

Defragment is one of those words that sends most user’s heads spinning but it’s very easy to understand. Oftentimes, a tech will leave this function running after they’ve completed servicing a PC. The software for doing this is included in Windows and it only takes a button press to start it. Basically, the function cleans up the hard drive so that files are more quickly-accessed.

6.Remove unwanted file

There are a number of unwanted and unused file on every computer which slow down its performance. It is highly recommended to remove these programs to free valuable resources of your computer.  delete TEMP and %TEMP%  by using   TEMP  and %TEMP% command in run.