I downloaded ubuntu 15.04 from canonical's website but wubi is ignoring that file and downloading ubuntu 14.10 x64 amd.but not my processor neither my motherboard are from amd.help me.it's urgent.
You will want to install from a Live USB or from a CD. A live USB disk can be created easily with unetbootin. WUBI is no longer supported. You can read more about this here:
Another good run-down is located here.
If you need help with the Ubuntu installation process then this page is a good starting place and we can then help with more specific questions if needed. Also, as I've been asked before, I have no idea why WUBI is still included when it doesn't usually work and is no longer officially supported.