Your post's headers (Outlook Express 6.00.2900.3138) tell us you're running
outdated and vulnerably versions of Outlook Express, Internet Explorer, and
WinXP SP3. Check in at http://windowsupdate.microsoft.com ASAP & install
all critical security updates offered. Then make sure Automatic Updates is
enabled to keep it fully patched.
--
~Robear Dyer (PA Bear)
MS MVP-IE, Mail, Security, Windows Client - since 2002


TKM wrote:
When replying to some OE6 e-mails, the computer seems to slow down,
editing
becomes more difficult (takes more clicks to move the cursor) and the
cursor
gets the "jitters". So far, I haven't been able to trace the problem to a
particular sender, e-mail content or whether or not there are attachments.
The problem has been apparent for the last few weeks.

The problem goes away if I click Format and move the setting from "Rich
Text" to "Plain Text" and back to "Rich Text" again.

Is there a better fix?

Running IE7 and XP Professional - no other problems.

TKM