In regards to the first two questions
1)"Get more features with a new edition of Windows7" that is referring to an upgade of a different Windows 7 product IE: upgrade from Home Premium to WinPRO or WinPro to Ultimate. There is no SP2 yet, so do not be worried.
2)"Your Windows experience needs to be refreshed" just means that the routine to check the numbers has not been run in X number of days or more. No need to rerun the routine if nothing hardware wise hasn't been changed.
For the last part about the numlock key: some interesting reading: http://answers.microsoft.com/en-us/windows/forum/windows_vista-desktop/keep-num-lock-on-after-start-up/b0d17415-acbf-41d7-95c2-4fbfe1700cfe
And it may solve your problem.