A pose file should only contain translation and rotation channels. You can easily fix the pose yourself:

• load an unmorphed figure of the correct type, don't worry about textures and such;
• disable inverse kinematics;
• if needed, load the guitar prop (the documentation that goes with the bought pose should tell you whether this is needed or not);
• apply the guitar pose to the figure;
• save the pose to your pose library. If Poser asks whether to include morph channels (Poser 7, maybe Poser 6 too), don't include them.

Done. You can use the new guitar pose and it will not affect any morphs.

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