When you first start AutoCAD 2007 some dialog boxes shows up to help you to easier learn new features. Without looking to much you simply check the checkbox for "Don't show me this again". Later (seconds or days) you want to see this dialogbox again. Here are some ways.
One way that restores many is to check the "Show all warning messages" checkbox in Tools>Options>System. Another one is to reset the profile completely using Tools>Options>Profiles>Reset.
The following tips requires that you are familiar with the registry.
The first thing that comes up is a dialog box Migrate Custom Settings. A previous version of AutoCAD (version 2000, 2000i, 2002, 2004, 2005 or 2006) is installed on this system. You can migrate settings and files from your previous product release to AutoCAD 2007.
When you install AutoCAD you can select if you want this feature to be installed or not.
If you accept the Migration it's saved in the registry at this location: [HKEY_CURRENT_USER\Software\Autodesk\AutoCAD\R17.0\ACAD-5001:409] "AutoMigrate"=dword:00000000
If you press Cancel in the Migration dialog box the value will be set to 2.
If you change the AutoMigrate value to 1 (AutoCAD has to be closed) the Migration will start again next time you start AutoCAD.
The second thing that comes up is a dialog box about Workspaces that ask you to "Choose a task-based workspace from the list below to set the initial workspace and the default drawing template file."
If you don't want to see this dialog box again it's saved to the registry and is saved to the profile.
[HKEY_CURRENT_USER\Software\Autodesk\AutoCAD\R17.0\ACAD-5001:409\Profiles\AutoCAD 2007\Drawing Window] "MoreHideWarningDialogs"=dword:00002000
AutoCAD 2007 above is the name of the profile. If you want to see this dialog box you should take the value for MoreHideWarningDialogs and subtract 2000 from it. Observe that 2000 is hexadecimal.
Selection Preview Cycling comes up if you for example holds down CTRL and selects a line. It says: "To cycle through overlapping objects, roll over the object on top, then hold SHIFT and press SPACEBAR repeatedly. To cycle through overlapping subobjects (faces, edges, and vertices) on 3D Solids, roll over the subobject on top, then hold CTRL and press SPACEBAR repeatedly."
If you don't want to see this one 200 is added to the MoreHideWarningDialogs value.
Walk and Fly Navigation Settings has the value 1000.
These are just some of the values for MoreHideWarningDialogs. When you find a new one you wonder about or know about just add a comment to this post.
If changes are made to MoreHideWarningDialogs in the registry the profile must not be current or active. Either close AutoCAD or change to another profile temporary.