XP guest crashing after moving to new hardware

[Forrest1]

Hello,
I've been using VirtualBox to host VMs for my school research, to make sure if there was any problem with my hardware I could quickly boot into the VM on another machine and continue. Now that exact problem has occurred and I am having serious problems.

My old machine was an AMD 6-core machine running Win7 x64 and using VirtualBox 4.2.18. I was doing development in a WinXP guest. When my old machine died, I moved to an Intel i7 4-core with a fresh Win7 x64 install + 4.3.6.

The first problem I had was with an error message saying "vt-x is disabled in the Bios." I could not change the settings (option grayed out), so I edited the config file and set it to false.
From here on out, it will just freeze instantly after getting to the WinXP "loading user settings" - shows red bar at top of screen.

I have tried everything I could think of as far as changing settings. I tried to disable everything possible in the old image. I also made a clean XP install which works fine, and compared the config file settings. The only thing I notice that I can't change in settings is the list of guest additional components. I deleted them manually and they reappear the next time I try and boot. Nothing helps, it freezes every time I boot.

I tried going back to 4.2.18, but that didn't solve the problem.

I hope someone can help. I have very little time to spare, as my defense date is coming up fast. I was diligent about backing up VM images, but I have the same problem with all of them.

Is there anything else I can try? Thanks in advance for any suggestions.

Here is my current config for this image: pastebin --- com/DyhtARK9
Here is my last logfile for this image: pastebin --- com/h1JKH5x2

[Perryg]

Instead of editing the file to turn off VT-x you should have enabled hardware virtualization in the hosts bios.
Turn that on and then undo what you did and it should come to life.

[Forrest1]

Thanks, that fixed the problem. What a relief!

I must sound like an idiot, but initially I looked for that setting and could not find it (had to dig out the advanced BIOS menus). I found an older forum post where someone else didn't have it and got stuck on trying to figure out why one image would run and the other one wouldn't. Thanks again for the help.