Open Proxy problem

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.

Code:

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* Connecting to irc.rizon.net (6665)
-
Please wait while we process your connection.
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-irc.thefear.ca- *** Looking up your hostname...
-
-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

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Since you don't remember what you did, then a repair install is likely to be the quickest first step. You could also check hijackthis entries, your host file and proxy information in your browser.

Use TCPView to find out which program keeps port 1080 open. Since it's SOCKS my bet is on sockpupet.