I removed a Sound Blaster Pro audio card as it seemed it didn't get along with an upgrade to Win98 SE, and installed a Turtle Beach Riviera PCI card. After installing the card I installed the software application CD. Everything went okay untill the end of the process. The program told me to reboot and I did. As the computer (a Packard Bell Legend 4610 running Win98 SE) was booting it found the CD-ROM and Mouse and then it said "No Operating system found". I then tried to reboot with the Win98 Startup Disk and it suggested running FDISK as the fixed disk did not have the correct partitions, I did and the screen read "No Fixed Disk Present". I have put back the original audio card and get the same result. I had put an upgrade of RAM to a total of 24MB and everthing was going along okay until this sound card change!!! WHAT DO I DO NOW?