Kindle Fire won't mount, can't access SD Card

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http://forums.androidcentral.com – My Kindle Fire 1st Gen is rooted, but still has stock ROM. I've installed the latest drivers using the Kindle Fire Utility v0.9.6. But now I can't access the kindle through a USB connected to my PC. So I can't copy a new ROM to the SD card. When connected to my PC through USB cable, Device Manager shows it as Android ADB Interface - not Kindle. So the computer recognizes it, but I just can't access the SD card. I've also tried the USB storage option under TWRP - still no good. I've searched and read for hours now and can't find a solution for this. Any ideas? Thanks, (HowTos)