dell keyboard problems

hi guys , just found this forum my first post. i have a dell inspiron 2200 notebook. keys s a q w tab 1 2 all stick. as of yesterday what is happening now is when i press one of these keys it comes up with another key. a gives me a and s
s gives me s and a w gives me q and w q gives me w and q. i have used the virtual keyboad but would like to fix this. i bought a can of air spay and even popped off a few keys and nothing helps. just wondering if this can be fixed before i buy a replacement keyboard and attempt to do something i have never done. thanks in advance. jj