What do you mean by void of warranty on installation of OS? Is there any specific regulations in this regard? Damn it! I deleted the rescue partition the moment I got the laptop, installed Vista and ubuntu myself!! Does anyone else know about this?
but that portion can be made available in vista too,Even i have Ubuntu and Vista dual booting on my desktop. It is very easy. Just keep some part of your harddisk unalloted, and ubuntu will automatically create 2 partitions and install from that unalloted space. Those partitions wont be visible in Vista. There wont be any complications or problems, dont worry.