He needs to edit his grub config and put in a delay to see the grub
boot menu. Open a terminal and type:

gksudo gedit /etc/default/grub

and look for the line "GRUB_TIMEOUT=0"

Set it to something higher like 5 seconds or so as follows:
GRUB_TIMEOUT=5

Save the file, close it, and in the terminal type 'sudo update-grub'.
On rebooting, he should now see the grub splash screen. Assuming the
Vista partition is still there safe and sound, if it does not show up
as one of the options on the boot grub menu, it may need to be added
manually.

See here for more details on configuring the Grub2 boot menu:
http://ubuntuforums.org/showthread.php?t=1195275

When I installed 11.04 I had the same problem.

A few other charastics, may be he didn't mention. During the boot up, when
the dual-boot menu usually appears, a message from the 24" ACER monitor
complained about a non-supported signal was being feed to it. After what
seemed like a longer than normal the Ubuntu desktop-boot-up screen appeared,
then there was 11.04. An FDISK or GParted showed that a Windows partition
was still there.

After a lot of pain-in-the-ass backing up Ubuntu and Windows files, the only
way I found to correct the like of dual-booting was a complete reinstall of
Windows and Ubuntu.

I do have good backups now and great documentation of all modifications and
software installs made on both OSs.

Chris, I tried the GRUB_TIMEOUT=0. Just like you said, no dual-boot menu,
straight to 10.10. Currently I'm using 10.10 because I could not figure out
how to get 11.04 to dual-boot. Then when I changed it back to
GRUB_TIMEOUT=10 and a 10 second dual-boot menu came up.

In addition to what Chris Becker and I said before...

After an removing Python and apparently a whole lot of other things I didn't
intend to in 10.10 64-bit last night Unbuntu became AXED. Upon a new
install, including Windows XP and then 11.04 64-bit, when the computer
rebooted the dual boot menu did not come up, instead it boots straight into
Ubuntu. This is just like 'coneydog33' said in the thread opening...

Using Chris's method below I found grub timeout as "GRUB_TIMEOUT=10", hum,
that's not what I expected.

Looking farther down I saw these two lines
# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL=console
so I uncommented the "GRUB_TERMINAL=console" line
GRUB_TERMINAL=console
In terminal executed 'sudo update-grub'

Now the beloved grub boot menu appears like before.

When you say along side, did he partition first of just try an install
and chose the free part of the drive,

the install re-partitioned the drive setting a small portion for Ubuntu and the
remaining for Windows. The Install program does this for you and he used the
default option as presented by the install program.

That install should have set a Grub menu up ?

I would try to delete and reinstall.