Ableton is only a 32 bit program.
The Cubase you’re using is 64 bit.
The host and the slave in Rewire have to match (32 bit to 32 bit, 64 bit to 64 bit).
What you’re currently attempting to do is unfortunately impossible.
However, you can install Cubase 32 bit and use it to rewire to Ableton. You can then record what you want and import it into Cubase 64 bit. The installer for Cubase 32 bit can be found on your install DVD.
Cubase 32 bit will install alongside Cubase 64 bit just fine (however, I wouldn’t recommend using them both at the same time).