freezing toad


I have toad version on brand new installation of winXP SP3.
When I choose to connect to database ( ver., toad freezes for a minute;
the same in case I choose ‘end connection’
When I connect to database, freezing is not happening.

I used toad ver., to connect to the same database
with the same oracle client without such problems

Can you pls, give me advice which settings in toad should I change in
order to avoid this freezing?

thanks a lot