Hi, My sister is having problems with her computer. The following is how she described them to me. Perhaps someone has an explanation for this problem. She had problems with it last month and took it into a computer shop to get repaired. (I believe she got struck with a virus.) Anyway, they fixed things and installed McAfee on her machine. She was using it at home with no problem. Then she downloaded an update to McAfee. During the install, she got a fatal exception error (Windows 98SE, if you were wondering about the OS). When she went to restart the computer, it gave her a message like, "Operating system not found on hard drive." Does anyone have a clue on what could have caused this?