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#11
Ah, I had this issue when I did this with an XP machine. What happened is you removed GRUB, the Linux bootloader that replaces the default Windows bootloader. Your master boot record was modified. Since GRUB is gone, nothing's there to load Windows.
Put in your 7 installation disc/startup repair disc and go to the the repair/recovery console (don't do startup repair). You might have to click "Advanced". Type "fixboot". Hit enter. "Type fixmbr". Hit enter. Reboot.