I'm so excited that you get to experience some wonderful updates and additions to your phone! -if you so choose to.
The build you are using for windows is AKU 2.0, which is officially 1 update "out-of-date".
Specifially your problem could be (in my opinion) either or both of,
1: Your SD card is broken/dirty
2: Your windows is having problems (more likely).
I'd suggest upgrading to Sprint Aku 2.2 for starters.
http://www.utstar.com/pcd/downloads/...11200_Ship.exe
found here:
http://www.utstar.com/pcd/Downloads.aspx
There are more recent updates that have not been released by Sprint available here on this website.
http://www.ppcgeeks.com/custom-rom-i...you-t2847.html
These are cooked roms, and are not supported by sprint or microsoft. But they work perfectly!
Also, you may want a PRL update. You can simply call *2 and ask for you account to be flagged.
Wait for the voice prompt, then say "PRL UPDATE"
Finally, there are some other upgrades that you can do, but I would suggest starting with the Sprint Update, then moving to PRL updates.
Keep reading, learning and asking questions here and you'll find yourself with an almost brand new phone!