Why is internet with my wireless router SOOO slow?

I just got a new Linksys E1000 wireless router, mainly for my PS3 and Laptop. It was aggravating hooking it up, but the PS3 and laptop both seem to be connected, however, my internet seems to be somewhat like dialup now... On my desktop, my download speeds are about ~150kbps, but I go and download something on my laptop, its like 6kbps... that's ridiculous, can anyone explain why?? I know my desktop has a wired connection, but can THAT much be lost, just from being wireless? Thanks to any help..