I'm not sure you are listening to me.
I wanted a screencap of this " Says it may be necessary to change compatibility in or for setup to complete ".
"With the Roxio USB Capture Device unplugged reboot the PC.
Click on the search and type %temp% a temp folder appears at the top, click it to open it.
From the menu bar click edit select all, then click file delete.
Reboot the PC, don't open any program, when it's up and running shut down/turn off your antivirus and firewall software.
Now load your installation disc and when it runs choose repair, does it finish or do you get the Syntax message coming up?"
When you rebooted after turning off antivirus/firewalls they came back on!
You have to do things in the order I tell you.