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Dell Inspiron won't start. Missing operating system error
I have a Dell Inspiron that won't start. It says it is missing its operating system.
Using the Windows 7 DVD that came with the machine I went through the repair Windows procedure 3 times. The first time it searched for restore points of which there are none because the machine has Rollback Rx installed instead. It then restarted with no change. I went through the same process but this time it said it had repaired Windows however; restarting gave me the same missing OS message. On the 3rd attempt it displayed the restored OS as being on D:\. I ran the diagnostic tool and it said no errors were found. Restarting gave the same error.
How can I get the machine to boot from D:\ or move the OS back to C:\ please?