I need to reinstall X11 on Lion. How can i do this?

After having downloaded and installed Wireshark I'm experiencing  some trouble with X11. It continuosly crashes and restart untile i logout. So i thought i need to reinstall X11. Is this correct? Is there someone having the same issue? How can i do it?
Thanks in advance
greetings

Hi guys, I have attempted to follow the steps above, but still nothing.
Running the following gives me no result:
find /Users/me/Library -name '*X11*'
I have moved /fink and /opt (darwinports) out of the way but still getting crashes
Also, no .xinitrc anywhere in the system
And as you can see below, even though I am on a MacBook air
which has pre-installed Lion, it's still priced at $30
I know it's a user configuration problem, as if I log in with another
user I do not get any crash... 
Does anybody know how can I find out what's crashing it?
I attach my crash log here

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