hi ever time i try 2 disable chat log my comper locks up?any ideas?

If disabling logs from Plus > Preferences > Logging > uncheck "Automatically log all my chats by default" doesn't work (which by the way is something really weird, do you have any plugins, add-on or something else that could be interfering?), try disabling logging from the registry:
Close Messenger.
Go to Start > Run, type "regedit" and press OK.
In the tree on the left, locate and select this key:
HKEY_CURRENT_USER\Software\Patchou\MsgPlus2\<your e-mail>\Preferences
Now, on the list on the right, locate and double click "EnableLogging", set its value to 0 and click OK. Restart Messenger.

ty 4 the quick reply but if i do that will it disable  the chat log 4 ever acount that signs in on me comp?

No, that will just disable logging for that account. If you want to disable logging for all accounts, you'll have to set EnableLogging=0 for every account that appears in HKEY_CURRENT_USER\Software\Patchou\MsgPlus2. BTW, in HKEY_CURRENT_USER\Software\Patchou\MsgPlus2\Nobody you can set the default preferences for new users.

hi me againlol when i click msgplus 2 only  thing that shows up is nobody when i click that  preference archive and date floreds comp up when i click prefrence there no emails there

I don't understand, could you explain it better?

I think he's not changed any of the default settings, or he's viewing HKCU under a different Windows account.