Standby & Update on Shut Down Problesm

I've been experiencing problems with my Computer not wanting to go to Standby mode. Also when I choose the shut down option, it says it's doing update 1 of #(varies) and it's supposed to shut down when complete. I get up the next morning to see the same shut down screen still doing update 1 of #.

I've tried going to the update site and doing updates but it says my computer is up to date.

It also seems to be running at 50% cpu capacity regardless of what I'm doing.

Thanks for Anyhelp you can give.

Matt