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Windows 7: Missing operating system message, cannot re-install windows 7


29 Aug 2010   #1

windows 7 home premium 64bit
 
 
Missing operating system message, cannot re-install windows 7

Hi All,

Shut down PC last night, all working perfectly. Today it won't boot with the "missing operating system" message. Have booted from Windows 7 installation disc, tried startup recovery - took 2 hours before reporting no automatic fix possible. It cannot find an installed Windows OS to do a system restore, so I attempted a "custom" clean re-install. However, I then get a "canot create system partition or find existing one" error message. I have tried to create a "New" one but nothing doing. I don't seem to have any HDD drivers to point to either.

I have two 500GB Western Digital WD5000 drives but that's all I know.

Can anyone help? Do I need fo reformat the C: drive?

Many thanks.

My System SpecsSystem Spec
.

29 Aug 2010   #2

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)
 
 

Quote   Quote: Originally Posted by rjs1974 View Post
Hi All,

Shut down PC last night, all working perfectly. Today it won't boot with the "missing operating system" message. Have booted from Windows 7 installation disc, tried startup recovery - took 2 hours before reporting no automatic fix possible. It cannot find an installed Windows OS to do a system restore, so I attempted a "custom" clean re-install. However, I then get a "canot create system partition or find existing one" error message. I have tried to create a "New" one but nothing doing. I don't seem to have any HDD drivers to point to either.

I have two 500GB Western Digital WD5000 drives but that's all I know.

Can anyone help? Do I need fo reformat the C: drive?

Many thanks.
Are both hD's seen in the bios setup ?
My System SpecsSystem Spec
29 Aug 2010   #3

Main - Windows 7 Pro SP1 64-Bit; 2nd - Windows Server 2008 R2
 
 

See if TestDisk can find your old Windows partition. If it does, and the reinstall attempt hasn't overwritten anything, you might be home free.

I'd also recommend running the hard drive test from WD:

WD Support > Downloads > Select Product

Edit: Doc beat me by a minute. Good advice!
My System SpecsSystem Spec
.


29 Aug 2010   #4

windows 7 home premium 64bit
 
 

Yes, I can see both drives in the BIOS setup - what does that mean?
My System SpecsSystem Spec
29 Aug 2010   #5
Microsoft MVP

 

Look in BIOS setup to make sure your DVD drive is set to boot first, then Windows 7 HD. Unplug all other HD's.

Boot the Windows 7 DVD Repair console or Repair CD, at first screen press Shift F10 to open a Command Line, type:

Diskpart
List Disk
Select Disk 0 (confirm this is Windows 7 HD #)
List partiiton
Select partition 1 (confirm this is Windows 7 partition #)
Active
exit

Now boot back into Windows 7 DVD Repair console, click through to Recovery Tools list to run Startup Repair up to 3 separate times with reboots no matter whether it finds an installation or not. Startup Repair - Run 3 Separate Times

If Windows 7 won't start, return to the Command Line to type:

bootrec.exe /fixboot
bootrec.exe /fixmbr

Now boot back into Repair console to see if it finds an installation to repair, then run Startup Repair up to 3 separate times with reboots.

If not, copy your files out using the DVD, then wipe the HD to try reinstall: Copy & Paste - in Windows Recovery Console
SSD / HDD : Optimize for Windows Reinstallation

If you have a Recovery Partition you can also try running it by tapping the key given on first boot screen to Run Factory Recovery.
My System SpecsSystem Spec
30 Aug 2010   #6

windows 7 home premium 64bit
 
 

Gregrocker:

When you say:

Diskpart
List Disk
Select Disk 0 (confirm this is Windows 7 HD #)
List partiiton
Select partition 1 (confirm this is Windows 7 partition #)
Active
exit

How do I know what HD number my Windows 7 HD is, and is the partition always #1?

Many thanks.
My System SpecsSystem Spec
30 Aug 2010   #7

windows 7 home premium 64bit
 
 

UPDATE:

When I run Diskpart I can select the disk ok, but when I do List Partition and then try to Select Partition 1, it says "There is no partition selected".

Any ideas?
My System SpecsSystem Spec
30 Aug 2010   #8

windows 7 home premium 64bit
 
 

Another update.

Ran Startup repair again. As yesterday, took 2 hours with no reboots occurring. At the end it said "Partition table is corrupt on disk \Device\Harddisk 0. Repair action: partition table repair. Error Code = 0x490.

What to do next please?

Many thanks.
My System SpecsSystem Spec
30 Aug 2010   #9

windows 7 home premium 64bit
 
 

Another update.

I tried the bootrec.exe and only the fixmbr worked, the other saying "element not found".

I also ran Testdisk and it found NO PARTITIONS at all, even after a "deeper search".

Does this mean HD failure or just severe corruption?

Please help someone, I have no idea what to try next.

Many thanks
My System SpecsSystem Spec
30 Aug 2010   #10

WIN7 Ultimate 64bit
 
 

Like you were told several posts ago

- Go to WD site & download the diagnostics/format program/s to read the 'Smart' off your hard drive!
My System SpecsSystem Spec
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 Missing operating system message, cannot re-install windows 7




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