My guess is that your machine cannot handle those particular 2 gig sticks. Although
this page would indicate it can take 4 gigs total, I don't see any Crucial brand compatible 2 gig sticks listed.
Do you have the 5570Z? (Check to the lower right of the spacebar, not the label on the bottom). If so, this model can only take 2 gig max
link
As a note, Frys (at least the two near where I live) are absolutely terribly for product, service, know-how, prices, and
anything really.
I prefer to order from
Mwave
As a final note, I've been very happy with my Acer laptop (4720Z). It's no computing powerhouse but is fantastic for the price.