Surfing the web

I have two big problems that I need to fix.  The first is that when I type some keys act like 'hot keys'. For example when I type The g my favorites menu opens.  It is REALLY annoying.  The other problem is that when I'm surfing The web and I scroll, my computer freezes. It will freeze For about 45sec.

Have anyone heard of these and what can I do.  I have a 4 years old gateway is a AMD athion, 500gb, running win 7.