When using Microsucks Word or the Open Office Writer (a free equivalent) make sure you have it enabled to underline questionable spellings. You can also set those programs to take a look at your grammar. Note that their suggestions are not always valid. And in some cases, you may just want to ignore them.
Similalry, with the Firefox browser, on this site, bad spellings are also underlined. Right clicking on the word gives you possible correct spellings.
Note that the first word of the previous paragraph is spelled incorrectly. It should be "Similarly". It was flagged as I was typing this, but I left it in as an example.
And "Microsucks" instead of Microsoft, in the first paragraph, is a deliberate misspelling. :-)