My computer is running slow what steps can I do to fix it?

Causes

1. Not enough hard disk space.
2. Left over programs and bad files.
3. Data Corruption.
4. Missing Windows updates / Outdated drivers.
5. Computer is overheating.
6. Corrupt OS.
7. Bad Hardware

Reboot

If your computer has not been reboot recently make sure to reboot it before following any of the below steps.

Not enough hard disk drive space

Verify that there is at least 200-500MB of free hard disk drive space. This available space allows the computer to have room for the swap file to increase in size as well as room for temporary files.

Background programs

Remove or disable any TSRs and startup programs that automatically start each time the computer boots.

 To see what programs are running in the background and how much memory and CPU they are using open Task Manager.  If you are running Windows 7 run Resmon to get a better understanding of how your computer is being used.

If you've got an anti-virus scanner on the computer, spyware protection program, or other security utility make sure it's not scanning your computer in the background. Often when these programs begin to scan the computer it can decrease the overall performance of your computer.

Scan for malware

Today, spyware and other malware is a big cause of many computer problems including a slow computer. Even if an anti-virus scanner is installed on the computer we recommend running a malware scan on the computer. Use the free version of Malwarebytes to scan your computer for malware.

Update Windows

Computer or processor is overheating

Make sure your computer and processor is not overheating, excessive heat can cause a significant decrease in computer performance some processors will even lower the speed of the processor automatically to help compensate for the heat related issues.

Dust, dirt, and hair can also constrict a proper air flow on your computer, which can also cause a computer to overheat. Make sure your computer case is clean and fans are not obstructed.