Chris, the above 4 letters were created using Microsoft IME 3.0 for Chinese (PRC).
Quite easy leh. (I can almost see you swearing "Show Off!" at me again, hee。）
To switch from 中文 to English, you just need to press the 中 (Chinese) button if you want it to toggle to English. You press the “英” (English) button again to toggle it back to Chinese.
Simple isn't it?
And to choose tones you can type the figure directly after the pinyin e.g. "ta" gives you 他 but "ta3" gives you 塔, and "ta4" gives you 踏。
Alternatively you can type "ta" first and get 他 and when it is underlined by the program, you hit the right arrow key - this will bring up a list of possible variations of the same hanyu pinyin character based on the various tones available. Press down arrow to move to the character you want and then hit