first you need to install Ccleaner and clean your computer and install Hitmanpro and run a full scan it deletes malware, spyware and junks file from your computer.
Upgrading your RAM You have to upgrade your ram for better performance.
Disk defragment-
Go to startup button-> All programs,->Accessories-> System Tools-> disk-defrag. this will organize your files on your hard-drive so that they are easier for the hard-drive to access and produce faster speeds.
Edit your performance
Click the Start button and select “System.” Click “Advanced System Settings” on the left and click the “Settings” button under Performance
Choose “Adjust for best performance” under Visual Effects to disable all the animations, or select “Custom” and disable the individual animations if you don’t want to see or you can select for better performance..
To Know more please visit at https://fixingblog.com/e-machine-computer-super-slow/