Yes, it sounds like you may not have the correct reader installed on your tablet to open the ebooks. There is a sticky in this forum that looks at the different Android apps for reading ebooks.
Which Galaxy Tab do you have? I would recommend starting with Aldiko if you have the small 7 inch one that has Android 2.2 or 2.3. But if you have a honeycomb tablet(pretty much any new 10 inch tablet with have 3.0 or 3.1 aka honeycomb), then Aldiko is a bit buggy and you may want to go for Moon+. You can also get the reader associated with whichever store you bought the books from. For example, the Nook App or the Kindle App.
If you already have a ereader installed, it may not be able to read the specific file type your ebooks are. It should tell you in the description which file types the reader can read.
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