I had the same problem and was able to fix it by following the instructions in this link:
http://forums.cnet.com/5208-7590_102-0.html?forumID=67&threadID=300180
Apparently, the regular uninstall procedure does not completely uninstall the software drivers. Then, if new drivers or software are installed, a conflict is created between the old drivers and the new drivers. You have to first run the DellXPCleanUpUtility to completely clean out the old software drivers. Then, you can install the new drivers successfully.
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