Hi jfb21057820,
Please try saving the drivers to your desktop and then running the installation.
A direct link to the drivers is below. Please place your cursor over that link and press the right mouse button:
Print Driver and Scan Utility Installer Ver.1.06 (Windows)
In the menu that appears, left click on "Save link as...". Choose "Desktop" in the window that pops up and then click the Save button.
Once the file has been downloaded, please go to your desktop, right click "md__-win-ts6400-1_06-ea34_2.exe" and then left click on "Run as Administrator".
If you continue to have difficulties, please contact one of Canon's Technical Support Representatives via phone or chat. To contact a Technical Support Representative, please use the link below to log into your My Canon account:
https://mycanon.usa.canon.com
Once logged in, click on your PIXMA TS6420a and then click on the Product Support button. When that page loads, click on either the Phone Support button or the Chat Support button to access support.
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