Help on CISCO 2821 router

I have been locked out of console and vty lines after entering the following commands,
line con 0
exec-timeout 5 0
logging synchronous
no exec
i also entered the same command on the vty lines and have configured no address for ethernet interface.

I have been locked out of my router i cant do any other configurations,my network is down.
Please help,how do reload to factory settings.