[lubuntu] grub rescue - trouble removing Lubuntu

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http://ubuntuforums.org – Hello guys, I have a problem with my mother's Windows 7 netbook. Some time ago I installed Lubuntu on it, but I didn't really use it, so I decided to remove it. Before removing its files I made myself a boot USB flashdrive to fix the MBR after the removal of Lubuntu (I used Hiren's BootCD, put it on a flashdrive). Here's the problem: when I decided to try it out before deleting Lubuntu, both systems (Windows and Lubuntu) became inaccessible. I get the following message with the USB drive sticked in: "An operating system wasn't found. Try disconnecting any drives that don't contain an (Hardware)