get me out of grub rescue command prompt...system does not boot properly

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http://forums.fedoraforum.org – I had windows xp on my desktop,I wanted to install fedora 16,so I tried with live usb first...,it wroked, then I wanted to install it to hard disk using the installer(anaconda,that was with in live usb ).I was installing,in between I came to know that all the data will be deleted,I have done some bad clicks...and some how came out of installer by completing the process,but when I reboot, what I see is windows xp does not boot, all my data on the haddisk is formatted/deleted and after "boot from cd" [ a black screen at booting stage] it shows "welcome to grub" error: unknow (HowTos)