1. Remove the large HDD since we can't take a chance that you have no backup copy.
2. Set the machine to boot from your 7 DVD or restore media and install Windows 7 then all the updates, drivers and security.
3. Shut down and add the old drive. Use Windows 7 EASY TRANSFER to move your user data and settings over.
CLONEZILLA won't help here as it does not, without a lot of work go from large to small drives. ACRONIS can do that!
Right now I have Windows 7 installed on the largest HD on my computer. I want to install Win7 to the smallest HD and use the larger one for data. What's the best (ie, easiest) way to do this? I have formatted the small drive already. I don't want to format the large one b/c there's a lot of data on there I want to keep. TIA