Help me out with this "grub rescue" issue ?

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http://www.linuxquestions.org – I had Windows 7 and Ubuntu 10.1 installed in my intel i3 4gig DDR Sony Vaio E-series laptop. Both operating system were working fine. Only problem that I used to have was the sound didn't use to play when I boot through Ubuntu. Due to that, I formatted the corresponding drive from Windows in which there was Ubuntu installed. I used "diskmgmt.msc" to delete the partition and then format it. The format was successful and when I restarted my computer, this error was displayed:- error: unknown filesystem grub rescue > Windows didn't load at all. I used to have multiple boot grub men (HowTos)