one of the most common problems to ocure with a pc is when everything freezes or locks up while you are using an application, and the mouse and key board will not respond.
well in this Instructable I am going to show you how to fix this problem
Step 1: Freezes and Lockups
never hastily turn the pc off as this can lead to further problems.
Step 2: Using Colntrol, Alt, and Delete
CTRL + ALT + DEL.
holding down these simultaneously should display the windows task manager .
Step 3: Windows Task Manager
click on the name of the application in the dialog box, and click on the end task button .
Step 4: End Task or Shutdown
ctrl + alt + del again, which shod reboot your machine. if the computer still won't respond, then you will have to press the restart button on the front of your PC, if you have one. if you don't have a restart button then you will have to turn the machine off, wait 15 seconds and then turn it on again in the conventional way.