Windows 7: 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

You should try the method two or method three of the tutorial Partition - Mark as Active then.

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

Than


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)?

It would be better to understand if you post a full screen snipshot of your disk management window. Generally the active partition is a 100MB NTFS primary partition.


Yes ! Disk - Clean and Clean All with Diskpart Command

For your reinstallation, SSD / HDD : Optimize for Windows Reinstallation .

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.

In this situation, I think you are right. You should wipe up your entire disk , and go for a clean install then . The steps you should follow in order to do it are ...

To wipe up the hard disk .. Disk - Clean and Clean All with Diskpart Command

To optimize the disk for reinstall ... SSD / HDD : Optimize for Windows Reinstallation .

For the installation .... Clean Install Windows 7 .

Before wiping up the disk, better you back up your data externally .

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

We hope so ! Best of luck