Should I Be Worried?

Today I received this email:

Your Yahoo! ID is: XXXXXXXXX
Your password for this account has recently been changed. You don't
need to do anything, this message is simply a notification to protect
the security of your account.

Please note: your new password may take awhile to activate. If it
doesn't work on your first try, please try it again later.

Only thing is, I have never changed my password. I don't really use my Yahoo email account so I'm not too concerned about that. I'm more worried about my Yahoo Music Service b/c my credit card info might be stored in that account. Eek! Since the email said the new password would take some time to activate, I tried to login to both accounts to see if I could still access it using the "old" password and then change it to something new. But it's too late - the new password is already in effect . It's not like there's a Yahoo phone number to call either so I have to do everything through on-line forms. The heck? I want an answer now!
What complicates things is that I've got some viruses on my computer I can't seem to get rid of. Part of me is paranoid that one of them is the kind of virus that records keystrokes or something. I've stopped accessing my financial accounts and paying bills on this computer for a while now... What to do, what to do?

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There is WAY too much drama on Chase Avenue! Friggin' soap opera I tell ya.