DISCLAIMER: This mod involves patching the NVRAM which is nothing but a battery powered RAM keeping certain settings for the BIOS and somewhat risky. Although we are running the same machines, there is a small risk that something can go wrong. The worst case scenario should be removing the NVRAM (or CMOS, whatever you call) battery to the best of my knowledge. However, don't keep me responsible for anything at all if anything happens to your UX, this is just a demonstration. You take the complete responsibility. So, you're warned.
to enable VT:
- First upgrade your BIOS to R0112N2 if you haven't already: http://esupport.sony.com/US/perl/swu-list.pl?mdl=VGN-UX390N®ion_id=1
- Prepare a DOS bootable USB stick. You can put either Windows98 files or ME files, both are fine. (Search google for this, there are tons of guides.)
- Search Google and find symcmos.exe, download it.
- Put symcmos.exe onto your DOS bootable flash disk.
- Plug in the flash disk to your UX, go into BIOS, put USB flash disk and USB harddisk on top, save changes and exit.
- Your ux should boot into command prompt. Type: symcmos.exe -v2 -l1.txt
- Remove flash disk, reboot into Windows. Plug in flash disk, there should be 1.txt in it.
- Open 1.txt in notepad. Go to the line where it says: (034E)  and change it so that it reads: (034E) 
- Save the file. Boot back into DOS, type: symcmos.exe -v2 -u1.txt
- Voila, VT should be enabled. Boot back into Windows and check it by securable: http://www.grc.com/securable.htm