if a non competition agreement is expired but I am still working for the company the contract is still valid?

Normally, the entire point of a non-compete agreement is to limit you from certain employment and activities after you leave employment.  So, I would be rather surprised if there was something in your agreement that allowed the non-compete provison to have to expired back in Feb 2012 though you are still employed.  You may have an employment agreement that refers to your terms and conditions of employment which may have expired, and can then be renewed simply by continuing to work for the company, even without a new written agreement.   To be safe, you should meet with an attorney who can review your agreement to verify whether it is still valid.