[Can't highlight text in word 2007]

I was able when I first intalled office 2007 to use it without any issues,
but all of a sudden I can not highlight text or copy text from word. I have
to use the shift and arrow key to highlight the text then control c. I only
have one version of office.
When I go into into the trust center I am not able to move around to check
add-ins, I can not move by using the arrown key the enter key or clicking on
the task I need.
I also start to notice that when I close office after saving I get a message
"stops working" I also can not open a existing document without opening word
first. Can someone help me please? I've ran service pack 1 and still to no
avail.
Thanks