You can only install the video driver on NT 5.0 Beta's 1515-1773, And only the mouse and keyboard drivers on XP beta's 2267-2459.
First, download the vpc additions of vpc 2004 SP1. You can get it here.
In your virtual machine, Open the start menu, then click run, then type in devmgmt.msc. Device manager is now open.
Now you will see multiple types of devices. The only ones you will need to worry about are the ones expanded in the screenshot. Let's go in order, shall we?
Collapse the display adapter, and you will see something like S3 Trio or something. Double click on it, to see the properties. Then select the adapter tab, and then Change...
Choose to select the drive manually from a list, And you will see a list of adapters to choose from. We don't want any of them so go ahead and select the Have disk button.
Note that some versions of Windows may display some additional boxes.
Mount the vpc 2004 additions iso, and enter this in the box: "D:/Windows/Windows/VMADD" Or browse to the location.
Now it will display the VPC S3 driver. Select it and click next. A popup box or two may appear, but you can click'em away anyway. If it prompts you the location of the file simply browse to the location i mentioned earlier and click next. If it prompts you te restart, DON'T DO IT UNLESS YOU INSTALLED ALL THE DRIVERS for reasons I will explain later.
Now, the display adapter is installed! Now you must do the same with the keyboard and mouse driver. Again, DON'T RESTART UNTIL YOU INSTALLED ALL THE DRIVERS Or the virtual machine won't detect the mouse and keyboard drivers!