registry cant run applications

[olocin]

hi gud day, i have a problem about User Restrictions in my OS win2kProf. When i was trying to edit user configuration in particular the "Run only allowed windows application" enabled it and added one application, when i click ok, suddenly i was not able to run .exe anymore cant even run documents, i was aware of this but it was an accident to add only 1 application. So the problem was how will i set the User restrictions to be back to its default configuration? or disable or set the "Run only allowed windows application" to not configured?