hi..i get a windows installer keeps popping up whenever i open outlook express
then install it
This a common problem.Try one of these -
Reinstall the application in question, and don't choose the This feature will be installed when required for any of the optional components.
However, this may not solve the problem .
Open the Group Policy Editor by selecting Run from the Start Menu, and typing gpedit.msc. (If the file is missing, run mmc.exe instead.
Then, select Add/Remove Snap-in from the Console menu, click Add, and double-click Group Policy. Click Finish, then Close, then Ok.)
Expand the following branches:
Local Computer Policy \ Computer Configuration \ Administrative Templates \ Windows Components \ Windows Installer
Double-click Disable Windows Installer to your right, click Enabled, and choose Always from the list. Click Ok when you're done.
The change will take effect immediately. If you added a snap in, as described above, you don't need to "save changes to the console."
Note: If you encounter an error about the Administrator Policy the next time you try to install an application, you'll have to re-enable the Windows Installer temporarily.
3.Use Windows Installer CleanUp Utility
More HERE and HERE