Just when you least expect it, computer errors can occur, and the appearance of a "iw3sp exe has encountered a problem and needs to close" can really catch you off guard; but just keep on with this brief tutorial, and I'll show you an easy way that will give you the means to do away with these errors.
It is common that these problems have as their source the computer's registry system - this is where your windows keeps track of software + hardware when you do installations, deinstallations, or updates on your pc. Over time, when you fill your computer with more and more applications, it's pretty common to eventually have an incorrect installation or removal of software; this is the moment when you can get a "iw3sp exe has encountered a problem and needs to close", an overall system slow down, and other concerning problems.
The problem is that some areas of your windows registry system might be damaged in some way, which causes windows to behave strangely and often quit when it tries to manage one or more of your software applications; in this case, windows displays those error messages you so hate to see. Anyhow, there's no need to get upset over it, since as i already stated in the first paragraph it is usually able to be repaired.
Before taking the expensive route by calling a professional technician, or take a chance 'playing' with the Problematic registry completely solo - wait! It is possible to fix a "iw3sp exe has encountered a problem and needs to close" on your own; even if you don't happen to be a computer whiz, you can use an easy and efficient utility to repair your registry - it will detect problem spots in the registry, and then finish the job by fixing them! Most applications of this type will even provide a certain number of free-of-charge searches and fixes, so there's no excuse not to give one a try and let it take care of your registry problem; there are good chances that in just a minute or two from now you'll take care of that annoying trouble for good.