I have Windows ME  and everytime I open the browser pops up a message:
Runtime error 226 at 0891655F and when I click OK it appears
anotherone, with the same message but at the end the number changes
for 0891629F.

Q.  How can I fix this?

According to someone on annoyances.org, it's a trojen and should be
cleaned up with an antivirus program like AVG
(http://www.grisoft.com/us/us_index.php) This could also indicate that
you should reinstall Windows ME. Of corse I would highly recommend
that you do not use Windows ME as it sucks and is full of bugs, one of
which is most likely responsible for these error messages. You should
upgrade you OS to something better like Windows 2000 or XP Home (the
Fisher Price operating system).

Dump ME.  It sucks, big time.  Please upgrade to XP.  You WILL thank us all!