I have a problem with a computer that had Linux OS installed (Ubuntu) a couple of times and after that, someone installed Windows XP. The OS choice menu now has one of the Ubuntu choices as default, some other Ubuntu choices following that, while the Windows one is the last. The only operating system available is actually Windows, all the hard drive space has been formatted and converted to two NTFS partitions.
I would like to delete the (invalid) Ubuntu entries and leave only the Windows choice so that the user wouldn't have to make any choices in the booting process and hide the OS choice menu altogether if there's only one choice (Windows).
Any help would be much appreciated. Edit I wasn't paying enough attention. I was in fact using the Grub loader. The fix was typing fixmbr at the recovery console, using a windows install cd. Thank you everybody for your help.