How to connect to a Windows PC through SSH from an Android phone? I have connectbot in my Android Phone (GT-N7000). How can I access a PC through that app ? I tried to use putty to establish ssh in my PC but it didn't work well. Can anyone give my a solution to this problem?
I guess there's some trouble in your conception: Connectbot is an SSH client, while Windows does not ship with an SSH server pre-installed. So unless you've installed some SSH server there yourself (details on that part are beyond the scope of this site), you won't have much luck connecting.

You didn't exactly write what you want to achieve, but there are different solution to connect your Android device to control your PC. As shipped, Windows supports the Remote Desktop Protocol (aka RDP), for which several Android clients exist. The page behind this link lists up some of them. Other than with Connectbot, this will be in graphical mode, not command-line.

A general solution (valid for other OSes as well) could also be using VNC. Again, this would require a server software to be installed on your PC, a corresponding client app on your Android device (also to be found on the mentioned list), and it would be in graphical mode.