I had two operating systems on my computer. They were both xp. One I had to put on because the other wasn't working properly. When I tried to delete the partition with the bad os, I used the windows CD and accentally went through the new install. When I finished the install, my computer wouldn't recognize my old os. I checked the files and they appear to be intact. The only way you can tell I had an operating system there before
the new one is to search the hard drive. Also I can log into it through dos (2 options for logon), but when I search for os's only the new ones appears. Please help, anyone !!!!

see if anything here helps:

2 xp's