How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask IT Miro Your Own Question
IT Miro
IT Miro, Computer Scientist
Category: Laptop
Satisfied Customers: 3140
Experience:  Bachelor's Degree in Information Technology, Microsoft Certified Professional
Type Your Laptop Question Here...
IT Miro is online now
A new question is answered every 9 seconds

I tried to install Windows 7 as a 2nd OS and selected a

Customer Question

I tried to install Windows 7 as a 2nd OS and selected a target empty 400GB volume. It first tried to install on the next sequential volume which was too small. I deleted the files it installed think clean volume is good. Now it cannot start, I've lost all access to my main c: drive and nothing can boot
JA: How much experience do you have with this particular machine?
Customer: I bought it 2.5 yrs ago, used the onboard win 8 Ok. Then Microsoft sent a strong message that I had to upgrade to 8.1 so I did that. I've installed
Multiple OS on other machines. This one went wrong somwhere
JA: What troubleshooting have you tried?
Customer: Rebooting, which noted that a file was missing. It gives a list of 4 boot options. I've chosen to try reboot of Win 7, but it always returns to the missing file message. I cannot make it boot from my win 8.1 volume
JA: The computer expert can solve this for you. Anything else you want him to know before I connect you two?
Customer: Not now. I have to get to sleep for work tomorrow. But you could have Someone contact me tomorrow afternoon.
Submitted: 1 year ago.
Category: Laptop
Expert:  IT Miro replied 1 year ago.

Hello! My name is*****
I am a certified computer professional who will assist you with the problem you described.

Based on the problem description, it seems that the attempted Windows 7 installation has overwritten or corrupted the master boot record, which would explain why the Windows 8.1 boot selection doesn't work anymore. For that reason, I suggest repairing the Windows 8.1 boot selection.

To do that, you need to use a Windows 8/8.1 disc. Insert it into the computer and boot from it. Select the language, click Next, and then click on "Repair your computer". Click on "Troubleshoot" and then "Advanced options". There click on "Startup Repair". The computer will restart and automatically fix the startup entries for Windows 8.1. After that, check if you can boot to Windows 8.1 as before.

In case it didn't work, try with the "System Restore" option instead. Choose any restore point that was created before you attempted to install Windows 7.

Let me know the results.

IT Miro