Hi Jackie,
O.K so the maximum RAM is 4GB in two slots so max 2GB in each slot.
The new 2GB RAM should be identical to the existing one. Read the label. If you can’t get one then you will have to buy two 2GB’s.
2 X 2GB DDR2-800 SODIMM:
https://www.crucial.com/compatible-upgra...
Changing RAM guide:
Acer Aspire 5517-1127 RAM Replacement
This Acer service manual may also help:
https://www.manualslib.com/download/2325...
While you are at it upgrade the hard drive to a SSD (Solid State Drive) and upgrade Windows 7 to Windows 10. It is free if legal copy of Windows 7.
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How do you do that?
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crwdns2934271:0crwdnd2934271:0 George Gibson crwdne2934271:0