When I open a Project without Maven capability (I never use Maven) I have those errors:

10/23/08 2:51:46 PM CEST: [INFO] User settings file does not exist C:\Documents and Settings\paolo\.m2\settings.xml
10/23/08 2:51:48 PM CEST: Error on adding indexing context central; C:\java\paolo\myeclipse\workspace\.metadata\.plugins\org.maven.ide.eclipse\nexus\central\_9.fdt (Impossibile trovare il file specificato)
10/23/08 2:51:49 PM CEST: [INFO] User settings file does not exist C:\Documents and Settings\paolo\.m2\settings.xml
10/23/08 2:52:16 PM CEST: [INFO] User settings file does not exist C:\Documents and Settings\paolo\.m2\settings.xml

How I can correct those errors?

Can you go to MyEclipse > Installation Summary > Installation Details and paste the information here for me. Do you have any maven plugin setup with MyEclipse?

paolo.clerici,
Thank you for sending me the installation details. Are you using the M2Eclipse plugin with MyEclipse ?

I have installed only "MyEclipse 6.5.1 GA ALL IN ONE" with no other plugin.

paolo.clerici, ,
This seems like an installation related issue to me. Can you please switch to a new workspace (File > Switch Workspace > Temp) and check if you get the same issue when you try opening the projects.

On new workspace I have not errors.

I guess you should import your projects into the new workspace and continue working.