No Default Operating System in Startup and Recovery dialog Win 7

Greetings;

Win 7, SP1, multi proc dell, one physical drive 2 partitions, nether marked as active

I'm 2 days into recovering from a Trojanos Alureon virus. Using this Encyclopedia entry: Trojan:DOS/Alureon.A - Learn more about malware - Microsoft Malware Protection Center

All is pretty good but when trying to troubleshoot a (related?) IE hijack issue, and going into safe boot, I found I could not get back to normal boot. It just stayed in Safe. I eventually replaced some boot files from a backup and it got back to normal.

I saw that there was not OS listed in MSConfig and none listed in the Startup and Recovery dialog.

No partitions are marked as active. I've tried to use the disk managment utility in Computer Managment to set the OS partition as active but I get an IO error.

Any suggestions appreciated
Thanks

Download the liveCD & Run, this is a free tool from MS:
https://www.sevenforums.com/tutorials...per.html?ltr=M

Than

   Information

Boot up using the Startup Repair CD or Windows 7 DVD. (not the OEM manufacturer's Recovery Disk) If you have a Netbook, you will need a CD/DVD drive.
NOTE: Make sure no USB drives are plugged in.
Do not use a USB Pendrive for Startup Repair.
startup repair disc-create

1) Use the Rebuild BCD in this tutorial:
How to use the Bootrec.exe tool in the Windows Recovery Environment to troubleshoot and repair startup issues in Windows



2) Restore MBR.

Thanks a lot guys-

I tried the Bootrec tool and it does not see Windows on my C: drive... only on a recovery drive.
I will try the cmd prmpt approach from Arc in a few minutes.

In looking at all the posts on the virus I had, I'm thinking a complete burn down is my best option.

As I'm typing and looking over at Computer Managment console on the bad machine, I see a little 2 MB partition that is marked active. It will not let get any info on it or let me do anyting to it. Looks like more reason to do a complete wipe.

Does the Win 7 install disk (non OEM) has all the tools to do a secure wipe and rebuild of an entire disk (only 1TB)?

   Information

We always assume you have made your Recovery Disks using the OEM manufacturer's Recovery Media Creator app the first day you had your new PC.
& made the Startup Repair CD.
startup repair disc-create

Did you make the DELL OEM manufacturer's Recovery Disks?

No Oem recovery... it was a vista machine originally

Attached is a snip of the disk window.

Thanks guys....
I hit the button of no return.... clean all just few minutes ago....
now I'll wait for 3 hours and read some of the words of wisdon here on the forum.

If nothing else, I'll have a nice clean Win 7 machine when I'm done.

Cheers