i removed peers.dat file and it worked fine after that
and do i have to change my address , or i can continue using old address that starts with 1
and where can i see my added address in wallet
Perfect. You have nothing to do. Your wallet is equivalent to a private key that is totally different from the 1xxx address which is used to receive funds.
Your coins are associated with the private key. ^^
However, if you want to know your new address in 2xxx you can do: "File -> Receiving address" And you will know your new 2xxx address.