PocketSOAP was separately installed with (now) quite old versions of the Aqilla MS Excel Add-in (it's now embedded in the add-in and does not appear separately). Sometimes the PocketSOAP uninstaller leaves traces of PocketSOAP which you need to hunt down.
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Start MS Excel and from Excel Options uncheck AqillaWebServiceAddin.
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Close Excel.
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Run a disk search and delete aqillaaddin.xla where found.
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Delete AqillaXLFunctions.dll from c:\windows\system32 and / or c:\windows\SysWOW64.
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Uninstall PocketSOAP from Control Panel > Programs > Program and Features. If not there, delete folder c:\Program Files*\Simon Fell.
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Reboot.