Circle with line after starting Mavericks install

Hi everyone,
I downloaded Mavericks and started the install. My Mac restarted, and the grey Apple logo turned into a circle with a line through it. It's been like this for around two hours now. There's the spinning "wait" circle below that. Has something gone wrong? I have a MacBook Pro, non-retina, mid-2012. I had OS X Mountain Lion 10.8.5 before starting the upgrade. Thanks!

Hey everyone,
Apologies for my impatience
I found that I could get back to ML by going into recovery mode and repairing permissions. I ran Apple Hardware Test and got no errors, so the hardware was okay. I contacted Apple Support via chat and resetting the SMC was suggested. I did that but it didn't work. So, I decided the best thing to do was to take my MacBook to the Genius Bar at the local Apple Store.
When the technician tried to install their copy of Mavericks, the installer froze up, so he force-quit it and rebooted in "select startup disk" mode (not sure that's the right term). He selected his 10.9 install disk and when it booted up, it looked like recovery mode. He used his Disk Utility to see if there was a problem with my hard disk. We had run my Mac's DU with no problem, but when he used theirs, we noticed that the volume wasn't mounted (greyed out). The main disk was there, but the volume beneath it was greyed out, and when he clicked the Mount button, it didn't. Disk Utility reported it as locked (not sure that means anything), but he simply couldn't mount the drive. He thought perhaps there was a FileVault issue. When I first got my Mac, I used FileVault to encrypt the hard disk. When I kept getting prompted for passwords too much, I decrypted it.
I made a Time Machine backup two days ago, after I got back into ML. The tech asked me if I was comfortable if we erased the disk, install Mavericks fresh, then I'd do a Migration Assistant to get my apps and files back. That's what we did. It took from 30 - 40 minutes to complete. After doing a fresh install of Mavericks, I migrated my data back - now I'm running Mavericks. I honestly don't know if this issue was really caused by my encrypting and decrypting my hard disk, if it was just a bad download of the Mavericks installer, or I had some sort of data corruption that prevented the installer from being able to access my hard disk.
I've read that it's best to install over ML, but in my case, it worked out better to erase the drive and install fresh, then use Migration Assistant and Time Machine to get my user account, apps, and files back. I'll hesitate using FileVault now, though.
I don't know if this information will help anyone, but this is what worked to get me up and running.

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http://kb.mit.edu/confluence/display/istcontrib/Manually+Removing+PGP+Desktop+fr om+Mac+OS+X
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