Okay, as I said before, I did create more unallocated space. The D drive is now smaller, but the C drive is no bigger. There's just a grey square where there was no grey square earlier. The text said something about saving the details in .htm, which I thought I had done, but the only thing I have is in .dat.
So. Any ideas on what went wrong, and do you think I can save it? Will (or should) I still be able to use my programs as before?