Key Strokes Changed in Word and Outlook Express

When typing new email messages in Outlook Express or sometimes even in Microsoft Word, my keyboard seems hijacked. Lower case becomes upper, or bold or italic. Also, it acts as though I have hit the CTRL key or ALT key, and jumps me to new screen. Also, when browsing, it jumps back a screen without me doing anything. I am brand new to this forum, so maybe problem was solved in the past. Thanks.