If keyboard shortcuts are not working in Excel first check Macro settings or disable Transition navigation keys and see. More suggestions here.

If your arrow keys are not working in Excel, there are a few simple ways to troubleshoot and solve this problem.

I keep my shortcut list in a small window I can Alt-Tab (or Alt-Esc) to when I want to refresh my memory. These shortcuts have really come in handy with the 2007 versions of Word and Excel.