DV9774ca, doubles i's and o's when typing.

Been using my fairly new DV9774ca for a couple months. Has Vista Home Premium SP2. All updates and that.
I do a lot of emails and I notice when typing emails in Windows Mail that it likes to double up i's and also o's a lot, and I can't say it does that for any other letters. I noticed this 100's of times so far and have to go back to fix it......BUT, when I type on forums and similar places it does not do this! I can type in many forums daily and hardly have any mistakes (not boasting about my brilliant typing skills! ). Never notice any double i or o if I type in this forum. But I am not kidding about the double i and o in emails. Its driving me insane.
So being it seems to happen in Windows Mail I blame that! Of course the simple solution would be to use another mail program. But thats whats on my laptop so far and I am used to using Outlook Express for years. I have not used Outlook ever.

Its not like I hold the i or o down too long compared to other keys, and its only in emails.
I typed this message here and no double letters at all, if this had been typed in Windows Mail I'd certainly have had a dozen doubled i's or o's! Honest.

Has anyone else run across this? Heard of it before? and what did you do?

Thanks.