Windows is Your Friend!
This is actually a feature built in to all versions of Windows, a free gift from Microsoft. The Blue Screen of Death (BSOD) is there to help you. Sometimes people work too hard, and they need a break from the computer. Windows automatically senses this (although sometimes it is fooled by excessive cursing and/or pounding on the keyboard), and forces you to take a break by displaying the BSOD.
Most people find that if they shut down the computer, consume a mind-altering substance, and then resume working, things work pretty much better for the rest of the day. However, if you find that the BSOD is popping up even when you're NOT over-worked or over-stressed, there may be a hardware and/or software issue involved.
What Causes the Blue Screen of Death?
Sometimes bad or flaky memory (RAM memory, not your hard drive) can cause seemingly random system crashes. If you have just the right combination of programs open and system memory in use, and your computer tries to access a "bad spot" on a RAM chip, the results can be unpredictable. Or they can be the Blue Screen of Death. You can try replacing your RAM sticks one at a time to see if the problem goes away. This involves opening up the system unit and looking at scary wires and stuff, so for some people just living with the problem may be a workable option.
More likely, you have a software problem. Some programs just don't get along... they trample on each other's memory spaces and confusion (or the BSOD) results. And it seems that Windows just gets old and cranky the longer you have it installed. You may solve the problem by using the System File Checker, or if all else fails, by
re-installing the Windows operating system and/or your software packages. If the problem seems to be limited to one particular program, try re-installing just that one first.
Spyware or a computer virus can also make strange things happen. My articles Spy, Counter-Spy and Do I need anti-virus software? will help you find and resolve any such problems.
Time For a New Computer?
And sometimes, bad things just happen to good computers. If you computer is more than three years old, it may be functionally obsolete. Read my How to Buy a Computer article for help in determining if a new PC is the right solution for you.