Packard Bell 486, 1.6G "c", 540M "d",cdrom "e",Win98.

"C" drive in explorer, but not in 'drives' in device manager. ['d' drive is. ]
Performance says drive using compatibility mode paging / reduces overall performance. Deleted hard disk controllers, drvdata.bin,drvidx.bin as per microsoft knowledge base info. Didn't find 'noide' listed in registry. Restarted system and everything was the same again. System runs slowly, sometimes can't write to 'A' drive, 'sys has perf illegal operation' message. Scanned for viruses with recent program. I have run out of things to try, any help will be greatly appreciated.
Steve... [email protected]