i unstall ubuntu now my laptop show msg .error no such partition grub rescue
 

i install the ubuntu and now unstall it.but now i can try to boot other operating system then a error msg show as; no such partition
grub rescue>

When you installed Ubuntu, it wrote part of the grub bootloader to the MBR (master boot record) of the hard drive. When you deleted the Ubuntu partition, the part of grub in the MBR was not removed. It is still there.

Now, your other OS does not have it's own bootloader in the MBR, and grub cannot find the rest of grub (it has been deleted). If your other OS is windows, you need to boot a windows install disk and run fixmbr to restore the MBR for windows. If you have an old windows 98 install disk, you can run fix mbr to repair the MBR for windows.

Or, if you have Vista or 7 (and I can see that you have Windows 7), use Startup Repair, which will definitely fix the MBR automatically from the Windows DVD.