Let's take a look at frozen and slow PCs.
One of the most annoying things about today's PCs and the modern
Windows operating system is that, every now and then, Windows has
an obnoxious tendency to freeze just as you were doing something
important--like saving a Word Document, or about to hit the Send
button in your Thunderbird email client.
Every user who's used their PC long enough has experienced this
frustrating annoyance. So, if this issue is inevitable, what should
one do when one is faced with an unresponsive, frozen PC?
Let's enumerate a few remedies to resurrect a frozen system.
First off, make sure that your PC's really frozen and not just
responding really slowly. Sometimes an application or a process
running in the background can hog all your CPU's cycles, causing
the appearance of being stuck.
Wait several minutes to see if your PC responds, as an application
may be saving a file, or an important service running in the background
may be performing a special CPU-intensive task.
It's important that when you first realize that your PC may be
frozen that you don't panic and shut down your PC by hitting the
power button out of sheer frustration.
The most important reason for not doing this is that you may still
have files that haven't been saved to disk, and you most certainly
don't want to lose any of your precious data.
If you believe your PC to be actually frozen solid, then try the
following tips below.
The Three Finger Salute

Every Windows user should become acquainted with the three finger
salute--pressing Ctrl+Alt+Del--which will display the Task Manager.
If you suspect a stuck PC, open up the Task Manager, clicking on
the Applications tab. Scan the items on the Applications tab and
look for any programs that are listed as "Not Responding".
If any program is flagged as unresponsive, selecting it and clicking
on End Task may fix the situation. After this, navigate on over
to the Processes Tab, and scan the list of processes, noting any
process that's taking up an abnormal amount of CPU cycles. Hit "End
Process" on any process that's taking 100% of your CPU's time.

If you cannot find any suspects in the Applications or Processes
tab, select "Turn Off" from the "Shut Down"
menu, allowing Windows to shut down cleanly and properly.
Chances are, nine times out of ten, when you boot your system back
up and everything's cleared out of RAM, this operation will rectify
the problem.
Is your Mouse and Keyboard Responding?
Determine whether your PC is still communicating with your mouse
and keyboard. For your mouse, move it around the screen. If your
mouse's pointer is stagnant, even after a few moments, then your
mouse is down for now.
Hit the Caps Lock key on your keyboard and see whether it lights
up; if it doesn't, your keyboard is out as well. Before doing a
hardware reboot, check if your mouse and keyboard are plugged in
properly if they're wired, or, for wireless devices, change their
batteries.
You may also want to try a different mouse or keyboard as a hardware
test, if you have extra ones lying around suitable for this purpose.
If all else fails, then your absolute last resort is a hardware
reboot. You'll only want to do this when nothing else works,
as any work that you've neglected to save will be lost. To do
a hardware reboot, press and hold your PC's power button until
it shuts off.
When you boot up your PC again, you'll experience a longer boot
time, for Windows performs various diagnostic tests whenever it
isn't cleanly powered down properly.
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