Boot up your Xbox without a game in the drive then go to memory. Make sure your thumbdrive is plugged into the controller or otherwise connected to the XBox. Your XBox will say that your thumbdrive is not working correctly and has been erased (i hope you didn't have anything valuable on it!). After this, simply plug that sucker into your computer. when the PC identifies the drive, it will ask if you would like to format it. Don't! Install Xplorer 360 to the desktop and as well, extract the NTSC folder within the compressed folder to the desktop as well. then start X 360 and go to >Drive >Open >Hard Drive or Memory Card. It will identify the thumbdrive as Partition 0 (the thumbdrive has been formated by the XBox as FatX so your PC will not recognize it on its own). Now Drag 'N' Drop the four folders inside NTSC to the right hand of the X 360. This will take about 15 minutes or so as the files aren't simply copied, but 'injected' onto the thumbdrive.
Once the Files have completed injecting onto the stick, you can now plug it into the XBox. You will want to access the Memory section of the Dashboard, then select the area where the thumbdrive is recognized (in the case of my install, it was Controller One). You will want to open that part, then press Right (->) on the D-Pad on the controller then copy the appropriate save file to the hard drive (in this case, The Splinter Cell Linux save). Now this will take a while again to copy, so its good to have something to do. This should take about ten minutes (blame the USB 1.1 connectivity of the XBox). when this is done you can check the hard drives contents in the Memory Section to confirm. When this is done, exit all that then remove the thumbdrive. Now load your Game and on to the next step!
Ok, no worries the long parts are past us, as the files are now on your hard drive! Boot the Game now (hit start to skip past the opening). Go to the Start Game Screen, and select the "Linux" profile. Hit A three times then watch the system load onto the BSOD installer (B@$tard Sons Of Dialup). You will now only have a few simple steps to follow. First, in case something like a power outage or other Act of Randomness inturrupts the install, select "Back up C Drive" first off! Confirm by selecting Yes after you start the backup process, and this will only take maybe a minute (it's all being done on the hard drive now so it's a LOT faster!). When that is completed, select "Install Softmod". This will load into a different screen where you will see a scroll down menu. Select "Backup EEEPROM". Then back it up to the E Drive. This will take a second. Then select "Install Softmod". this may take 3 to 5 minutes. once this is done, select "Back To Main Menu". Then select "Restart XBox".
Just restart the XBox now and enjoy the payoff!