Please help! I have used OE for ages to download/upload e-mails onto hotmail.

Recently, OE has been automatically changing the status of some of my new
unread e-mails to read. This even happens whilst I am viewing the list of
e-mails in my inbox - they just change to read. My firewall and antivirus is
up-to-date. I wondered if I had a hacker, so changed my hotmail password,
but it is still happening.

Does anyone have any ideas on how to rectify this problem.

Many thanks,
Helen.