Usually what I find is that people have too many programs running. You’ll see a lot of programs running down by your clock, and these take up memory. When your memory is used up, your computer will start to use your hard drive as “virtual memory”. The problem with this is that your hard drive is slower at accessing data than you RAM or memory is. So step number 1 in speeding up your PC is close any unneeded programs.
There can also be registry errors in Windows slowing you down. Use a program like Ccleaner to scan for registry problems and fix them. That’s step 2.
Step 3 would be to defrag your hard drive. This reorganizes the data on you drive so that the computer can access it faster. A hard drive writes data all over the drive so eventually it will slow down because of this fragmentation. So run a defrag!
Step 4 would be to clean up you startup items. You can use Ccleaner to also do this task. You can click on any program you don’t need at the time you start your computer and either delete it or disable it (just in case).
So in summary:
Step 1: Close programs you don’t need open
Step 2: Fix registry errors
Step 3: Defrag your hard drive(s)
Step 4: Clean up you startup items