I accidently turned on my filterkeys, now I can use my number pad
 

My numbers above keypad also are in shift position, like if I type 1, it
comes out ! I also can't highlight just one cell, it selects a group of them.

I accidently turned on my filterkeys, now I can use my number pad
 

For the group selection, try pressing F8 which toggles extended selection
("EXT" appears in the bottom status bar when it is on). There are some other
ways to do this (menus as well as different key combinations), but
unfortunately, I have drawn a blank...

I have a feeling that if that does not work that one of your Shift keys is
stuck, or malfunctioning.

Hope this helps, Jim
--
I appreciate any feedback. Please don''t be scared to say that "Yes,"
I/someone else did answer your question. Thank you.