1. Your software is not up-to-date.
2. Windows is no up-to-date.
3. Files are corrupt (clean your computer to fix errors).
4. You have Windows Service Pack 2 installed.
5. You have Windows...
There are not many easy to see changes between Windows XP Service Pack 1 and 2, but if we sneak under the bonnet, then there are a small handful which we can see. First of all, the security measures...