I have an old HP Pavilion 6635 that was running Windows 2000. It has an Intel Celeron 533 MHz processor. Not a great computer, but I was happy with it as a back up for writing and editing video files, etc. I ran into a problem with it a couple of days ago where it wouldn't let me access display settings. It's never had an internet connection, so there couldn't have been a virus, but I did a CC Clean on the system. I somehow removed something essential from the registry as the computer sut own and wouldn't restart into Windows , but rather gave me a 'no operating system found' message instead. (I backed up the registry, but it does me no good, as I cannot access the back up.) How do I know it was registry related? There was an error message that said something about a registry thing missing before the 'no operating system' message, but I didn't write it down and haven't seen it since.
I got into BIOS and found that no hard drive is listed. I went into the computer and adjusted physical connections, but only the CD drive shows up in BIOS. I attempted using a CD with Windows 2000 reinstall/repair on it, and it cannot find an existing operating system or (using different paths) it cannot detect a hard drive, or requires additional drivers on a floppy disk, which I don't have the capability of creating, as my Dell doesn't have a floppy drive. I attempted to use a flash drive, but couldn't figure out how to get the computer to recognize it instead of a floppy in the A drive.
I know it's an old computer, with an unsupported operating system (if it's even still there), but I hate to give up without making every effort. Any guidance or assistance would be greatly appreciated. I've pretty much exhausted my meager knowledge.