Alexis23 wrote:My Windows keeps telling me I need something
No, no, no... That's
not the proper way to report an issue. You don't go with a generic
"I need something", you describe
exactly what you see, the
exact error message. In your case that would be:
VirtualBox Guest Additions update available!
Your guest is currently running the Guest Additions version A.B.C. We recommend updating to the latest version (X.Y.Z) by choosing the Install[1] option from the Devices menu.
Now, re-using an image from the User Manual, and looking under the "Devices" menu, what do you see?

Do you see that last entry there? "Insert Guest Additions CD image..."
[1] ?
You do
not care where that image is! That's the whole point. You click on that menu entry and you're done, the Guest Additions CD is now inserted on your guest. Depending on your guest, you then follow the instructions specific to your guest:
User Manual
Or in other words, with the VM window having the focus, go to the host's menu "Devices" » "Insert Guest Additions CD Image...". If not prompted by auto-run, run "VBoxWindowsAdditions.exe" from the CD.
Alexis23 wrote:I'm following the instructions.
Not completely, partially only.
Alexis23 wrote:How do I know that what i'm donig isn't working?
1) You won't be prompted again to update the GAs
2) If you hover over the VirtualBox icon in the tray in your guest, you'll the updated version in the tooltip.
Alexis23 wrote:• I don't know whether or not the guest OS has autorun disabled (I assume yes).
• assuming autorun is disabled, as is sounds like something I'd like to be working, I don't know how to change that.
Now,
that would be something worth searching on the Internet for...
Alexis23 wrote:how to I run the installer manually from the vitrual CD? I've selected 'Insert Guest Additions CD image' but nothing seems to happen
Inserting a CD on itself does nothing. See above.
But those are NOT VirtualBox related questions, those are Windows questions. You should know your guest OS. Or learn it. But not in the VirtualBox forums, we can't be discussing
every detail of
every OS supported, this isn't an OS-support forum, this is a VirtualBox-support forum.
Alexis23 wrote:I'll do a search for the user manual and see if I can find it
A "search"?
How about going to the "Help" menu » "Contents"? That opens a
searchable PDF included with your installation (Help » Contents). If not, there's the
on-line manual in PDF format,
again searchable. Take advantage of that fact, and use it to search the PDF for the terms that interest you.
[1]: I may be
partially responsible for the wording...

That menu entry used to be called "Install Guest Additions..." and that got changed on Oct/2013, see
ticket #12200. I may have to reopen that ticket and amend it to include the Windows Tooltip as well...