Open Proxy problem

[xShrimp]

Hey guys,
So I have this one little problem. Not too long ago, I tried to set up my computer as a proxy server so I can bypass some firewalls at school (long breaks, need something to do ) But that was a failure so I thought nothing of uninstalling it. But now when I go on IRC servers using mIRC, they won't let me connect because I have an open proxy of some sort.
I can only remember some of the programs I used trying to set up a proxy server:
cygwin
sockpuppet
wingate (uninstalled)
WinVNC (I think I uninstalled)

cygwin is only a folder and executable files, but when I tried to delete the folder, it tells me that cygcrypt-0.dll is in use and I can't remove it.

Is there some way to remove this open proxy that I can't find?


Edit: Here is what I get when I tried to connect.

* Connecting to irc.rizon.net (6665)
-
Please wait while we process your connection.
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-irc.thefear.ca- *** Looking up your hostname...
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-irc.thefear.ca- *** Checking Ident
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-irc.thefear.ca- *** No Ident response
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-irc.thefear.ca- *** Found your hostname
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-irc.thefear.ca- *** Banned Temporary K-line 4320 min. - [G][py-bopm] Insecure proxy found, SOCKS5:1080 - Visit http://en.wikipedia.org/wiki/Open_proxy for more information. (Akill ID: AOHGW4QB38) (2009/3/22 22.57)
-
* Disconnected