Apparent conflict between my wireless adapter and...

I recently purchased an Acer Aspire M1100, (it comes with 2GB of RAM). I also purchased a ZONET ZEW1602 wireless card, and an additional 1GB of RAM, (the computer comes with Windows Vista Home Premium 32 bit installed). I installed the wireless adapter and booted up. Vista recognized the card and installed the Marvell Libertas adapter drivers. I then shut the computer down, installed the additional RAM and booted up again. Now the wireless card doesn't work. As soon as I removed the new RAM, the wireless card works fine. The computer works OK without the wireless card, and with the added RAM, (the computer recognizes the added RAM, and seems to run faster with it too.) How do I resolve this so that I can get both the RAM AND the wireless card working?