Here is my bonehead problem. I have an older Dell Optiplex GX1 system. I installed 2 drives and Win 2000. Everything was working fine but I did not like the letter designations of the drives (C: Primary HDD; D: CD-ROM; E: Slave HDD). So I wanted to switch the D: and E: drive designations. Using the Disk Management utility in Win 2000, I switched them. Following that I get a Disk I/O Error. I tried to switch it back and that did not resolve the problem. I disconnected the slave HDD drive and now am re-installing Win 2000 with the hopes of resolving the issue. Any suggestions/comments??