I am in the process of signing up for Direct TV and I currently have Time Warner for cable TV and internet.

Will Direct TV interfere with my ability to use the High Speed Cable?

Read something about diplexing the signals if thats possible.

Thanks in advance!!!

I am in the process of signing up for Direct TV and I currently have Time Warner for cable TV and internet.

Will Direct TV interfere with my ability to use the High Speed Cable?

Of course not.

Read something about diplexing the signals if thats possible.

You can't have them going over the same wire, no; apparently there has been equipment in the past that could be used for that, but with current implementations, their frequency spaces overlap, so you'd end up with a lot of useless channels. So no, you'd need to have separate wiring.