Problems with Trial Office security updates

[ROXANNE]

I have been getting Windows Updates for my Trial Version of Office2007 that
came on my 3 yr. old laptop for a year or so. Error code 646. MS finally told
me last time this went on (constant reminders to update for months) and after
talking to several Office specialists... to "hide" the updates. Finally the
messages quit. Now, I have 2 new scary update warnings. I hid these new
updates, but I worry that I could still get a virus or something thru the
Trial, when I receive emails with Office info to read for my home business. I
got a warning today I'd never seen about "Macros" and read about it, but when
I closed the box, the Office object I'd clicked on previously opened anyway.
I do have some glitches right now due to lack of memory on my pc, which I
plan to add to this week. I can't find anything about this update problem
anywhere. I get worried sick about viruses, and what to look at, or not. I
don't know much about pc, except when I'm forced to read about problems I
have.