Mouse Scroll Not Working - Keyboard Missing Letters

My mouse and keyboard has both started to behave strange.
1.The mouse scroll wheel works sometimes when surfing on internet , but most of the time it does not. It works fine when typing in Word.
2.The mouse pointer jumps around randomly.
3.The left mouse button sometimes behaves as if it is the right button.
4.Sometimes the computer seems to freeze and will not respond to mouse commands. This can be “reset” by ctrl+alt+delete, and choosing “switch to” the program I was working in. This can happen even when only one program is running.
5.Sometimes the mouse seems to left-click and drag by itself.
6.The keyboard sometimes misses letters that I press