Well neither of them lasted long after posting 8 posts each, these are quickly seen and dealt with, but there is nothing that is close to this being a huge problem.
All forums get spam, especially those that are very popular, but we can stop bots trying to do this up to a point, but you can't stop a human registering, sitting dormant for a little while and then posting.
Being a support forum you don't want to make posting so difficult as to make it almost impossible for people to seek help. So there has to be a reasonable balance and pro-active users using the report to moderator links in the posts. Done report each and every one just one for each different user/spammer, so as not to swamp/spam the moderators inbox.
