To enable Code Editor Error Insight feature, you'll need to edit registry. By default, Delphi 8 registry settings are stored in HKEY_CURRENT_USER\Software\Borland\BDS\2.0.
Locate the "Globals" key (represented as a tree-item-folder in Regedit) and add a string value named "ShowMeProblemsCorbin" containing a value of 1.
Note: you might need to register the ToolsAPI type library. Go to the command prompt and run a line like:
tregsvr -s -t Borland.Studio.ToolsAPI.tlb
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