After upgrade, could not see anything screen "Out of frequency"

I have Dell with an Radeon X600 with 256 Mb of RAM. I upgraded from Win XP
SP2 to Vista RTM. When it boot, I could not see anything and it would display
"out of frequency". This was very scarry as I could do nothing without seeing.
For a plug and play environment I was very disapointed to see this happen.
And I consider myself a pretty savy computer engineer.
The computer would reboot, but even pressing F8, it would not give me a menu.

I had numerous failed attempts to go into safe mode and change the
resolution to a low resolution, update the video driver and so on. At last, I
spoke to my MS friend and he pointed out that ATI has a beta driver. ALthough
he was skeptical that the Windows driver did not work, he suggested to try
downloading the beta.
vuala. I can now see.......

----------------
This post is a suggestion for Microsoft, and Microsoft responds to the
suggestions with the most votes. To vote for this suggestion, click the "I
Agree" button in the message pane. If you do not see the button, follow this
link to open the suggestion in the Microsoft Web-based Newsreader and then
click "I Agree" in the message pane.

http://windowshelp.microsoft.com/com...allation_setup