I wouldn't mess around with the above solutions of attempting to take ownership of all the system folders, as that may compromise system security.
For the following solution, read only the bold text for a TL;DR.
I had this same issue with my ASUS G75VW. Since you're also on a laptop, I'm willing to wager you have some sort of drivers installed for your touch pad, just as I did. It's likely that such drivers are the same ones you've had installed since you had Windows 7.
First, try attempting to uninstall your touch pad drivers via Control Panel (the driver might be listed as "Synaptics Touch Pad Driver"). If you can't find it there, press
Win+X and attempt to locate it in Device Manager, potentially in the section where you might find input devices.
Then, restart your computer. After restarting, you'll see that touch services should no longer be invoked, and your tabs in Firefox should no longer be huge (that's one of the symptoms that I had on my computer, so I'm listing it here for search engine purposes). You can now proceed to update your touch pad drivers to the version compatible with Windows 8.