Where's my folders?

OK, I know this topic has been talked about before, but it's not the same. First the info: Win 7/64. LR3.5/CS 5(ACR 6.5) on an internal SSD(C drive). On a seperate internal drive(D drive) I have image files(a folder with sub folders) that I import images into, and the LRcat and LR backups. I imported images from an NFL game on 9 OCT to the folder I have labled NFL(a sub folder) inside the folder labled images. The path was through LR (where you can choose a destination to import images) and had no problem doing so. This past sunday, I went to import images (from the game I shot earlier in the day) using the same way that I had 2 weeks earlier but while the drive was there, the "Images" folder was not available. Only the LRcat and LR Backups. I checked "Computer" and the D drive and all the folders were there. Why didn't it show up this last time?