Not that many projects require virtualbox and I would suggest it is confusing a few people that haven't got it installed. On the homepage https://quchempedia.univ-angers.fr/athome/ under the "want more help section" I'd recommend you write that Boinc+Virtualbox is required for this project.

Cheers

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Good idea, except that it isn't if you run Linux, as I do.
https://quchempedia.univ-angers.fr/athome/results.php?hostid=5947

But the Windows users could use the instruction to avoid a lot of confusion.