Returning it - wireless doesn't work

I bought this at Fry's and spent about 8 hours trying to get it to work. I tried every workaround i could think of and found that it will work when wired to the router or when wireless security is turned off. however it does not work once WPA or WEP encryption is enabled on my Linksys wireless router. Firmware is up-to-date on both my router and this device, still doesn't work. I've been working in IT for over 10 years and this product is the worst off the shelve computing device i've ever purchased.