C10 is usually a bug that makes you show up as still logged into SRO, a little (if that makes any sense... if it thought your account was fully connected it would say this user is already connected)
You can log on to another account, that's a problem. It confirms that it's your account remains if you will, still latched onto the server a little...
I've had the error before after a dc / crash, but it only lasted around 10 minutes.
You have two options;
1. Continue trying to fix the problem like I would
or, if you aren't as addicted to SRO as I am (lol)
2. Wait until mondays inspection
If you can't connect after mondays inspection you're really, really screwed unless joymax decides to step in.
Anyway, assuming you're a fellow addict

start --> run --> cmd
ipconfig /release
ipconfig /renew
ipconfig /flushdns
connect to silkroadonline.net
btw, you have tried unplugging your router AND Modem for one minute right..?
could even try a direct connection from modem to computer just to try.
Regards,
Rachel Gomez