If your computer has not been rebooted recently, make sure to reboot it before following any of the steps below.
Scan for malware
Today, spyware and other malware is a big cause of many computer problems, including a slow computer. Even if an antivirus 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.
Make sure you have all the latest Updates installed on the computer.
If you are on the Internet when your computer is slow, make sure all browser plugins are up-to-date. You can also try disabling browser plug-ins to see if one of them is causing the slowness.
If you have had your computer for more than two years, you may need more memory. Today, we suggest computers have a minimum of 4 GB of memory (RAM).
By having enough memory for programs to run within memory, your computer will not need to swap information stored in memory to the swap file. If the hard drive light is constantly active, it can be an indication the computer is frequently swapping information between your memory and hard drive.
Erase computer and start over
If none of the above solutions resolve your issues, another option is to either reinstall the operating system or erase everything and then start over.
Erasing everything and starting over can increase performance by getting rid of old software or drivers that may be on the computer and causing the computer to be slow. Installing a fresh copy of Windows, software programs, and the latest drivers help verify there are no software related issues causing your computer to be slow.