No OS found - insert OS setup disk, then press any key

[Tee Bear]

When computer is powered up, I get this message:
"No OS found - insert OS setup disk, then press any key"
I do nothing but press a key and Windows starts up.
Can anyone tell me what's going on???

 

[nitroman84]

Sounds like your MBR may be damaged, have a look at this tutorial.

 

[DeaconFrost]

You may also want to check that your drive is still showing in the BIOS and set to be the boot device. Also, make sure you don't have any flash drives or card readers plugged in.

 

[gregrocker]

Boot into http://www.sevenforums.com/tutorials/668-system-recovery-options.html to run Startup Repair a few times.