1. Have you made any changes to your computer?
2. When exactly did you receive this error message?
3. Which applications are you referring to?
I would suggest you to perform clean boot and check.
How to configure Windows XP to start in a "clean boot" state
Note: Also, see the section on how to return your computer to a Normal startup mode by following the steps under “Steps to configure Windows to use a Normal startup state”.
I would also suggest you to refer the link and check.
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