HP ipaq 5550 - Bluetooth error
The error message is telling you that there is not enough memory to load the BlueTooth driver, try moving some of your files from My Documents/My Music etc. to your memory card.
Also try uninstalling some of your programs and reinstalling them to your memory card, this will free up a fair bit of space in main memory and hopefully resolve the problem.
Also; Tap Start, tap Settings, then tap the System tab and tap Memory.
Tap the Main tab to see how much space is available in main memory, you should see a total of around 115-120MB available (128MB - the lie of storage device sizes - the file system) divided in to storage memory and program memory, if you see considerably less then you're iPaq has a hardware memory problem and will need repairing.
Lastly keep in mind that Windows error messages cannot be trusted and the actual problem may be absolutely nothing to do with memory, so if this doesn't help post back.