Is the distraction of a computer based on the internet? If so, stay off-line when you write. I'm always amused by people who see me working on my laptop somewhere, and ask me what the password for the wi-fi is. When I tell them I'm just working on a document and not on-line, I get the most jawdropping looks. Everybody assumes that everybody is connected 24/7. Don't be.

As for me, I do a lot of longhand (much more convenient than the computer if I'm out somewhere), but work about equally well on the keyboard. I do sometimes notice a difference in prose style, however. I tend to be wordier in longhand. As I'm aware of that, it represents no real problem in editing, and I do a lot of rough editing as I write, anyway.