darkulX

1. and 2. no UEFI/EFI. It's a board built in 2009, I guess. (I talked about me, but it is my brother's PC). 3. Yes, all worked well with the dual boot system. We suspect Puran Boot Defrag to be the reason for the crashes now. Linux still worked. 4. Yes, no Windows but Linux. 5. Oh, I guess some Mandriva derivate. 6. Almost aware, have to read it again or more precisely, thx. 7. Ok, maybe I did that also too fast and not precisely enough with bootrec. Yes, the priority is Windows. But I have to say the time to analyze it was too much for my brother. I was not there today and he did either a repair installation of Win7 or a clean installation, so the whole case is closed even if I would have liked to find the reason behind all this. Thx to all for your detailed help. Cheers

@Derek891 How To Fix STOP 0x0000007B Errors 1. Done. 2. No. Except after the BSOD occured checked if AHCI was on/off and changed that twice. Doesn't matter. 3. No SCSI chain 4. HD accessible through Linux or Startup repair. So properly installed 5. As you can see, one of my steps right now is a virus search. 6. Never changed the HD controller driver which always worked 7. IDE is on in BIOS 8. chkdsk /f /r ran without errors. 9. Not yet done, this extensive HD test. 10. fixmbr tried as you can see in the above post. 11-12. New BIOS, Load Default, no help 13. No new controller firmware available 14. Repairing the Windows installation is the last step I'll try. 15. Clean installation is the option which is no option as long as others work.

The problem is that I even have no safemode menu to choose all those options. So I cannot choose "Last Known Good ... " Maybe a problem is that there was GRUB on the system to start a Linux partition or the Windows partition. fixmbr killed GRUB but didn't help with the safemode menu. The only option menu I get is the "Startup Repair" and "Start Windows normal" menu. No F8 working after that. Always trying to startup Win7 which results in the BSOD after a few seconds (2-6 seconds) which means relatively early in the Win7 booting process. I tried: - booting into safemode minimal by using BCDEDIT bcdedit /set {default} safeboot minimal but all I got was the same BSOD 0x7B. - bootrec /fixmbr and bootrec /fixboot also did no job for me, problem persisted. - used a Win7-64 SP1 DVD to use Startup Repair. Problems couldn't be fixed by this tool. - even installed a new BIOS to circumvent a boot option menu and activate F8. Also to no avail. Next steps: - virus search with Rescue CDs - repair installation (if possible)

My system runs into a Bluescreen STOP 0x7B after I chose Boot-Time-Defrag. Now I can't boot anymore, even not in Safe Mode. Is there a way to edit the system somehow to prevent the Boot-Time-Defrag from starting? I have no System Restore Point due to personal idiocy Is there a nice helper out there?