Yes of course you can. The first thing to do is to understand the changes that the new legal structure will bring and as long as you find that changing your company to a limited liability company, then the process is far from being hard. Information for the process and the steps that you should follow has been provided here:
http://financialmemos.com/questions/what-is-limited-liability-company-and-how-it-is-formed/
And here:
http://financialmemos.com/questions/how-is-limited-liability-company-formed/