Backup that old wallet of yours, and write down anything you remember about what the passphrase might contain (patterns, words, dates, numbers, anything you can think of!).
There are easy ways to recover passphrases if you remember enough.
Armory might not be the most suited wallet for you, I'd suggest using a more user friendly one such as
multibit or
electrum (which is not fully endorsed by bitcoin.org).
EDITED
I thought I had a problem, but I have resolved it now, so I changed this post.
I do have a question though. Will a 4 gig flash drive be able to hold a wallet backup or two?
PS, computer now fixed got an expert to clean it out for a fee.
Many thanks.