Hi, I have "BOOTMGR is missing" when booting on my 8GB usb key. I'm trying to install Win 7 from an ISO file with WinSetupFromUSB tool, and here are the steps I followed before having the BOOTMGR error : - run WinSetupFromUSB - choose RMPrepUSB 1,2,3: WinPE v2/.../Win7 bootable (BOOTMGR) (CC4) 4:Fat32 and "Boot as HDD (C;2PTNS)" (but also another time without checking this) 5:my ISO folder 6:Prepare Drive 7:eject drive, click "OK", then eject and insert on my other PC with an empty HDD -> "BOOTMGR is missing" I've seen that some other has "Bootmgr missing" but didn't notice any answer on that point to solve my problem... Maybe it was too difficult for me to understand all. Here is the log file: 2011/03/09 07:58:22- RMPrepUSB closed 2011/03/09 07:58:27- Flushing disk cache to \\.\F: 2011/03/09 07:58:27- FlushFileBuffers Output: 1 2011/03/09 07:58:27- CloseHandle Output: 1 2011/03/09 07:58:28- Getting USB drives information 2011/03/09 07:58:28- Show all drives option is NOT selected, displaying USB drives only 2011/03/09 07:58:28- USB Flash Memory USB Device 2011/03/09 07:58:29- DeviceID: \\.\PHYSICALDRIVE1 2011/03/09 07:58:29- PNPDeviceID: USBSTOR\DISK&VEN_&PROD_USB_FLASH_MEMORY&REV_PMAP\001D92AD6C41B9408321007E&0 2011/03/09 07:58:29- Partitions count: 2 2011/03/09 07:58:29- Disk--Partition: Disk #1, Partition #0 2011/03/09 07:58:29- Logical Disk: F: File system: FAT32 Primary: True 2011/03/09 07:58:29- Disk--Partition: Disk #1, Partition #1 2011/03/09 07:58:30- Drive letter of the selected partition- F: 2011/03/09 07:58:30- Drive letter of the first primary partition in selected disk- F: 2011/03/09 07:58:30- Disk number of the selected disk- 1 2011/03/09 07:58:30- PNPId of the selected disk- USBSTOR\DISK&VEN_&PROD_USB_FLASH_MEMORY&REV_PMAP\001D92AD6C41B9408321007E&0 2011/03/09 07:58:30- File system type of the selected partition- FAT32 2011/03/09 07:58:30- Disk type of the selected disk- Removable 2011/03/09 07:58:30- Total target size avialable- 3892 MB 2011/03/09 07:58:30- Checking sizes... 2011/03/09 07:58:30- Total source size- 0 MB 2011/03/09 07:58:30- Target space available- 3892 MB I've tried the "Installer Grub Bootloader" button in a second time, with the current usb key, but it tells me the error "copy grldr to usb drive F ?" and then "ERROR grldr failed to copy to usb drive F. File not found".