how did you put backtrack 3 on your usb? did you follow any videos or tutorials? in any case, this issue is pretty much saying that when you select to boot bt3, the bootloader cant find the kernel that is needed to load bt3. also vmware player is not needed unless you want to run the virtual machine version of bt3. last but not least, dont take this as an assult, but from what i can see, you are new to linux, i suggest using a simpler distro of linux. start with ubuntu, learn the basics then move on.