A note about how Microsoft boot.ini switches work can be found here before you begin:
http://support.microsoft.com/kb/316739
To Install VU 12.6.3 on Windows XP via this method: (if you don't have 3 or more GB RAM, I may have another solution)
1. You need 3 ~ 4 GB of RAM installed in your computer minimum
(works for XP x64 too)
2. Goto "My Computer" on your desktop, click on the right mouse
button, scroll down to "Properties" and left mouse button click.
3. Under the General Tab check the "Computer:" section
for 3.00 to 3.25 GB RAM showing up.
4.
a. If you don't have that amount you need a copy of the
new files to supplement a manual patch.
or
b. If you do have this amount of RAM continue to #5
5. Click on the "Advanced" tab in the "System Properties" window.
6. Click on the "Settings" button under the "Startup and Recovery" section.
7. Click on the "Edit" button, a new "notepad.exe" window will open
with the current settings you have in the boot.ini file.
8. The current boot.ini will look like this:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Home Edition" /noexecute=optin /fastdetect
9. Change it so it contains the switches for 3 GB RAM visibility
and user environment as 2560 MB, depends on how your system
chip set is using your memory you will get 2.0 ~ 2.5 GB RAM
to work with. Change the boot.ini to look like this
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Home Edition" /noexecute=optin /fastdetect /3GB /Userva=2560
10. Click on "File" drop down menu, click on "Save",
go to reboot your computer normally.
11. When you reboot, go download immediately.
12. While you wait for it to download, you can go back
to the System Properties window for the boot.ini
and edit the file again to reflect the old setting
as:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Home Edition" /noexecute=optin /fastdetect
13. Hit "File" in drop down menu and hit "Save".
14. Now this will not take effect until you reboot your
system after your installation / update completes
correctly. When you are done doing that installation
update.
15. Run the "Repair Tool" on the "clientloader" and look
for files that don't belong, delete them if they
appear.
16. Close the "clientloader" and go to reboot your
computer normally. Then come in to the game and
enjoy.