[SYSDM]
- Simplify the message box code.
- Inform the user that a reboot is requied when the pagefile settings have changed.

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@62722 97493ccd-5924-5043-b1f5-66cb403b36ce
[NPFS]
Fix failing tests

CORE-7451


git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@62724 97493ccd-5924-5043-b1f5-66cb403b36ce