DPP i don't like, it is far to harsh and you don't have good control over the image. Im sure there will be people who disagree with me but its personal taste.
Have you installed the Drivers for your 450D onto your PC though EOS Utilities? as i have never had a issue with getting things to work once i installed the drivers as it has the raw codec embedded in the install.
Plus working with RAW helps you with your colour and processing in Photoshop essentially giving you more colours to work with (H, please correct me if im wrong at any stage here). Plus when your stacking your images with Flats, Dark and Bias reduction frames working in RAW will give you a much better result.
Learning basic processing skills is the key stone to your image coming good. look up Ken Crawfords utilities on his web page there is hours of good information with respect to Photoshop and processing with astro photos.
Just for interest i have given a little bit of balance to your image hope you don't mind.
Brendan
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