Use Google Groups Advanced Search and look for your name. You can also
constrain the search to a time period and to a newsgroup.
You are having difficulties because you are accessing these newsgroups
from the web interface, which is clumsy and the worst way to do it.
Here is information to give you a better experience:
Since you are using the web interface, you may not realize that this is
really a newsgroup. You will get far more out of this resource if you
learn to use a newsreader. There are many good newsreaders for Windows,
but you can use Outlook Express since you already have it. Here are
some links to information about newsgroups: