Cannot import LiveJournal posts and comments

I’ve tried several times to import four years of LiveJournal posts and comments to my new WordPress site. The first time, all posts were imported (but many came through 3-4 times) but no comments. The next few attempts resulted in only a few posts coming through along with all comments (some repeated up to six times). I’m using WordPress 3.2.1 version and wonder if the import tool is not compatible.

Computer-wise, I function at a very basic level so please do not worry about talking down to me.

Thank you in advance for any help you can offer.