unable to install fedora15 on windows7 64bit ultimate
 

hello!
i am trying to install fedora15 on windows7 ultimate 64bit but at the time of starting installation the error "unable to mount root fs on unknows block(9,2)" is displayed is there any solution to this problem.
thanking you in advance.

Sorry ... you're trying to install an operating system on another operating system? ... are you intending to dual-boot or use a virtualisation product ?

iam trying to dual boot

I expect your windows 7 installation is using up the entire disk. You need to shrink one of your windows partitions to make room to install Fedora 15. No more specific advice can be given without your partition information.