I get that sometime too. The exact same error message. It could mean that your PC is hung up on a particular process. Mine gets hung up when trying to delete some video files (usually pretty large files) and my process for IE jumps through the roof.
Don't know why it happens, but a disk cleanup and degrag generally helps me. Until it gets all cluttered up again. I only have a single partition on my hard drive so it's always working hard.