I just got the ACER 3680 as well. It has two slots for memory. You may want to have someone familiar with computers install it for you, although it isn't difficult. You just pop the card into the slot and seat it well.
Also, if you aren't familiar with microsoft office, I might suggest Open Office instead. I love the Office Suite, but Open Office is free and includes all of the programs which work very much like the Office Suite. Just go to www.openoffice.org
and download. there is good support on the site and this program will always be free, so no additional costs for upgrades.