For future reference, it's actually こんにちは。
As for Japanese, you don't need a Japanese keyboard to type Japanese (and actually you won't really want one anyway.. unless for novelty purposes). You can type Japanese phonetically using Microsoft's IME, which is built into Windows. You may need to download the Japanese language pack (or install it from a Windows disk). It's much faster than learning the kana layout of a Japanese keyboard.
Pretty decent guide on how to set it up here ->
Declan's Guide to Installing and Using Microsoft's Japanese IME - Windows Vista, XP & 2000
がんばってください！