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Win7 64 bit Home Premium no longer boots past start-up screen

I have a dell studio xps 1340 that came installed w Vista Home premium 64 bit.  I received the updgrade disk for 64 bit Win 7 and installed it a year ago. No issues. Today I used a Toshiba external backup harddrive with its loaded backup software to backup the machine. I let it run and when I came back it seemed finished.  I realized something had gone wrong and the registry settings had been changed to reference 32 bit apps. I suspect the Toshiba backup was only geared for 32bit and has changed overwritten registry files. for example, I clicked in Windows explorer which I keep pinned to the task bar and it said: Winexplore.exe not a valid 32bit exe (or something like that).  I tried opening Media Player and it said something similar.  I tried Zune and it said it was no longer installed.  I rebooted the machine and it now hangs at a black screen (but I have cursor) after the Windows is starting screen.  I have to force shut down and then when relaunching I have the same experience regardless of choosing Safe Mode, Safe Mode with Networking, Safe Mode command prompt, or start normally.  I must get all my data back before anything else.  It is clearly all there and functioning.  I could access files before I rebooted. Please help.  I live and work in Kigali Rwanda and have no real access to technical expertise.  I have the installation disks.  I tried putting in the disk when booting to see if I could boot to a repair option, but that didn't make a difference.  
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Gregu1
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Gregu1
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jcimarronCommented:
Gregu1--"to see if I could boot to a repair option, but that didn't make a difference. "
Does that mean the PC still did not boot past the start up screen?
What happens if you put the Windows DVD in before turning the power on?
http://www.sevenforums.com/tutorials/681-startup-repair.html
I understand you cannot get into Safe Mode.
Can you create a UBCD disk on some one else's PC and then use it on yours?
http://www.ubcd4win.com/  (click Downloads in the left panel)
Or similarly make a copy of the Win7 System Repair Disks on someone else's PC?
http://neosmart.net/blog/2009/windows-7-system-repair-discs/
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Gregu1Author Commented:
Thanks, Yes, I mean that the PC does not boot past the start up screen/logo that says Windows is starting.  It goes from there to black screen and just hangs.  Never gets to logon.  And I have that experience regardless of choice of Safe Mode, Safe Mode with Networking, Safe Mode with Command Prompt, or Start Windows Normally.  I have tried having the the Win7 Upgrade DVD in before turning on power but that doesn't make a difference.  It doesn't recognize it.
It is almost midnight here so I will try to connect with a friend here to try creating the disks you suggest.  The UBCD doesn't seem to be related to Win7?
The idea about Win7 System Repair Disks might work.  I will see if I can get that done at by a friend here.
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jcimarronCommented:
Gregu1--"The UBCD doesn't seem to be related to Win7?"
I believe it is.  But you have nothing to lose except the time to make the UCBD disk.
http://ubcd4win.com/forum/index.php?showtopic=14778
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Gregu1Author Commented:
I will try that as well. It's now 8 in the a.m. here in Rwanda and I have a friend downloading the System Repair Disk torrent now. Our bandwidth speeds here are very slow and it will take 3-4 hours.  We will try the UCBD disk as well if no luck.  The download should be finished in a while and I will get online at his house to check in as we go.  thanks again.
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NarayanyrCommented:
Hi,
   Would suggest you to try booting the system in safe mode by pressing F8 button when the system starts up,and selecting the safe mode option from the boot menu.If this is not helping please do a clean install of   OS and it will be fixed.

Thanks
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Gregu1Author Commented:
Fortunately jcimmarron's suggestion to: ..... make a copy of the Win7 System Repair Disks on someone else's PC?  http://neosmart.net/blog/2009/windows-7-system-repair-discs/
worked perfectly.  I downloaded via a friends PC and was able to F12 for boot options and point to cd/dvd drive and then do a system restore from 5 days ago.  I'm back up and running with all data.  Great suggestion - saved my life.
I couldn't risk the clean install since my backup was corrupted and I would have lost all data.

Thanks much for the help!  Already recommending this service to friends/colleagues.  Living in a place like Africa this is invaluable.
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Gregu1Author Commented:
I greatly appreciated the speedy response and the number of options to evaluate.  
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jcimarronCommented:
Gregu1--Glad to hear the good news!
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