I have Windows XP with An error messageThe application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem. Because I do not know how to fix. Can I upgrade to Windows 7 if this still exist. Thank you for your time and efforts in this matter

If you get this error when you boot up its down to an application which is auto starting when winxp starts, it means that auto-starting app has a problem with its configerationYou cannot upgrade to Win7 unless your hardware supports win7, and unless the programs you use will run under win7.As a first step you can run the Win7 Upgrad Advisor, which will give an indicationIn any case an upgrade from winxp to win7 requires a clean install, so you will lose everything on the winxp drive