I installed the operating system with the reinstalling disk which made it the primary basic OS.Looking in Computer when open, it showed 2 Hard Disk Drives, OS(C and Recovery (D. When I start the computer the Recovery OS is used when started. Looking at OS(C), it shows my original OS. So it seems to me if I deleted the Recovery OS, my original OS will come on. I am not sure but my question is: How can I switch to OS(C) and delite the RecoveryOS. The OS is Vista Home Premium 32 bit on a Dell Inspiron 1525 lap top.