I don't think the Nero Express that came with your computer has the feature to burn an image. Since I assume it's free and just has some basic feature on it. Is there a way for you to expand the left panel (there should be an arrow there). If so there should be an option to switch to Nero Burning Rom.
Heres a list of CD/DVD burning software
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Alex Feinman's ISO Recorder Power Toy ( Free )
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Nero Burning ROM
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Padus DiscJuggler
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NTI CD Maker 2000 Professional
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Roxio Easy CD Creator 4/5/6
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Roxio Easy Media Creator (version 7.x)
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Burnatonce (Freeware for personal use)
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CdBurner XP PRo (Freeware )
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Deepburner Free (Freeware)
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BurnCDCC
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Burn4Free
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ISOBurn
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Express Burn
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DVD Decrypter