Hello i i have a usb that has wifislax i guess it is kde as i can see from the start button from the side i need to change my bootloader but i cant find how can somebody help me please?

You will need to access your BIOS to enable booting from your USB stick.

HTH

I did do that i have live booted to wifislax which is kde but i have windows 7 how can i boot on that one? @toad

Your boot process should not have been touched unless you actually installed wifislax. Did you? If so you would need to install a package within wifislax called os-prober and update grub to be able to boot your win7 again. Not ever having used slack linux I would advise you to go to there wiki and read up on it.

Or have I misunderstood?