My laptop wont start up...

it might assuming they're the same version

e.g. Home Premium and what not

They don't have to be the same version of windows. They all come with the same set of tools for recovery.

@Retalion

If the disc you're talking about is the windows anytime upgrade disc, they it should work. If you can't boot from it, download that Vista Repair Disc ISO I posted in my previous post, burn the image onto a CD and boot from that.