I have a Fujitsu Lifebook series 500 laptop that I purchased a new HDD because when I tried to load an operating system on the old one it said the operating system was too small. Well, now with the new drive, it says the same thing. When my son told me the system spontaneously lost the operating system, I thought it was a virus, but that can't be because the new drive was clean and formatted. I've tried boot disks, windows 3.1, everything I can think of without success. Can you offer some solutions?