It looks like you have scatted the files so your 1st step is to try the auto repair again.
If it does not work then grab a pen and paper. go to start>search >files and folders.This wii open the search window, Go to tools> folder options>view tab.
Select show hidden files and folders. Untick Hide protected operating system files. Click apply click ok in search for files or folders put in the 1st file on your list. Make sure look in is set to C: click on search now when the file pops up click on it ONCE only it will then show where the file is. Copy the file to the same path on the 80gig.
Is this a graphic card or an onboard graphic card?
I assume the 10gig has the sam drivers up till the point of when you upgraded. If this is true then go into device manager (via right click on my computer) click on + sign next to display adapterclick on the image under that then right click go to propertities > driver tab>driver details write down the path to the drivers. Some will be C:\winnt\system32\drivers
some will be C:\winnt\system32. The aim here is to find the paths of the drivers then we go into the 80gig and remove the new ones. Do you know the date you did this?
If unclear on anything DO NOTHING and come back to me