HP probook 4310s shift keys acting strange

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Hello,
My shift keys on my fairly new HP probook 4310s are acting strange. The left shift key does not work and just returns everything in lower case. The right shift key gives various results including two letters instead of one - see the following examples C = CE , P = ?P , O= >O , I = <I . Again using the right shift key the position of the @ and " key positions have transposed! Just prior to this happening I started to get "do you want to turn sticky keys on" which was a message hard to get rid off. Any ideas welcome