Hi @cedarj ,
What OS is installed in the PC?
How much RAM is installed in the PC?
Have you checked what programs may be started when you first boot the PC?
If Win 10 installed, right click on taskbar and select Task manager > Startup to view.
Google the programs that you don't recognize to see if they are necessary to be run at startup.
If Win 7 installed, type msconfig in search box on desktop.
Have you done a virus check or a malware check to see if malicious software is not hogging the memory etc?