Keyboard doing crazy things?

Alright, a few weeks ago, my keyboard started exhibiting some bizarre behavior. when i press the \ key, i get, as follows, \7* in a single hit. also, when i use my keypad on the far right, when i press th 0 key, it opens up a window as if i ha click the right mouse button or that little button between alt and crtl key.not only that, but the caps lock light is staying on no matter what. on the number pad, when i press 7 it gives me the \ symbol, outs the typing cursor thing at teh begining of the line and puts a * where it landed. the 9 key goes up he space where i jsut typed, 5 gives me a - symbol. 2 gives me 2 with a + like this: 2+. 1 gives me: 16. 3 goes up a line and gives me 3/ where it landed. 6 gives me 16. 4 gives me 49. 8 goes to the begining of the line and gives me an 8 and a period. when i turn on num lock, it acts as if i clicked the right button on the mouse. the asterisk gives me \*. and a few more. i need help with this. its driving me nuts.if any of you know what to do, please tell me. i have tried cleaning the keys many times. if i need to get a new keyboard or laptop even, i will.... though i'd rather not. but i will do what is necessary. thank you in advance ^^