[ClydeF]

I have been using Outlook Express 6 which seems to be working fine. However, I wanted to switch to Outlook. When I try to install Outlook, I get a message that "Outlook Express 5 or higher needs to be installed." It is installed and working.
When I boot up the computer, I get a message that "Outlook Express has been removed and asks if I want to remove related files." I don't want to lose all of my stuff in Outlook Express, so I say "No" and the system continues with boot-up.
I am running Windows XP Pro with 2.53 GHz system and 1.00 GHz RAM. I have scanned for Adware, and Spyware and run a good antivirus program (Avast) which is kept up to date. I am also using Office XP.
Can someone please assist with this or will I have to do a complete "format" and start over.
Thanks for any assistance.

[ClydeF]

Looks like no answers to this one. However, I found the problem as below :
"This happens after setting the IsInstalled flags to 0, as a part of the suggestion in article Q318378. But, after reinstallation of Internet Explorer, the IsInstalled value should change to 1 automatically. If that does not happen, manually edit the registry and set the value to 1 in both of these locations
For Internet Explorer
HKEY_LOCAL_MACHINE
\SOFTWARE
\Microsoft
\Active Setup
\Installed Components
\{89820200-ECBD-11cf-8B85-00AA005B4383}
For Outlook Express
HKEY_LOCAL_MACHINE
\SOFTWARE
\Microsoft
\Active Setup
\Installed Components
\{44BBA840-CC51-11CF-AAFA-00AA00B6015C}"