Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
My guess is that you installed windows then partitioned the rest of the drive after you got everything up and running.
You can change the letters of the optical drives, no problem. Right-click My Computer > manage (or start > control panel > administrative > computer management > drive management); in the bottom right-hand pane, right-click the optical drive you want to change the letter on, select change drive letters and paths, change the letter to something out there (I like m and n), repeat for other drive, reboot.
If you are lucky, windows will move the drive letter down for you. If not, I think that you can change the drive letter of a NON-SYSTEM drive (i.e. your second partition) without too much problem by following the same method.
There is a catch to all of this. Any programs that are installed already that have a path that look for an optical drive on a particular letter, or have data on the second partition that the registry points to, will most likely be broken. You may have to reinstall a lot of stuff just to get things back to normal. Fair warning.
Yeah, you should be able to change through Disk Management. Just go into Control Panel and double click on Administrative Tools. Then double click on Computer Management. In the window that pops up there will be a tree view on the left side. One of the categories is Storage. Within that category is another category called Disk Management. Click on Disk Management. This will bring up a list of your disks and optical drives in the right side window. In the top portion of the right side window right click on a drive you want to change the letter of and choose Change Drive Letter and Path.
I believe you will first have to change your D and E drives something like W and X first. Then change your other SATA drive (F) to D. Then you should be able to change your DVD drives to E and F.