AddOn 1GB Industry Standard DDR2-400MHz UDIMM - DDR2 - 1 GB - DIMM 240-pin

The product was in great shape, quickly delivered, and looked great. The only problem was that it did not fit my computer. It was probably my mistake, but it was the 2nd generation and I needed the first. Can I return it to the local Wal-Mart store for refund? Thank you!

Wonderful price. I installed 4 into my HP WindowsXP Professional to increase its capacity to upgrade to Windows 7 eventually. though Windows XP will only recognize 3 GB or a little more (3.19GB in my PC though the computer recognizes the 4GB at startup) They work fine but be careful not to put the RAM in backwards as I first did, prompting a warning screech and light from the computer. When I reversed the RAM all was OK. Theoretically there is only one way to install RAM but... I had earlier returned another brand of more expensive RAM when the same thing happened but I probably installed those wrong too and the RAM was fine and would have worked OK had I installed it right.