Tabs with icons

A recent usability test suggested that users had a hard time finding how to complete tasks, mostly because they couldn't find the buttons on a ribbon UI (like Office).

My first reaction was to organize main actions on a "Home" tab and set the this tab as the initial/selected one.

I'm also thinking about icons... but I'm not sure.

Could small icons help users detect better the purpose of a tab, by giving a hint of the main action?

Examples:

No icon at all:
None

Only the File tab with an icon or maybe just the selected tab:
Only the first tab

All tabs with icons (except Home, I simply don't know which icon to use):
All (Except home)

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