Argh preinstalled software which cannot be uninstalled... the worst kind.
Usually you can just uninstall crap like this from the control panel or from the Vaio Care suite, but no not this one...
Open up a command prompt and paste these instructions.
regsvr32 /u "C:\Program Files\Sony\VAIO Gate\VAIOGateDesktopShellExt.dll"
regsvr32 /u "C:\Program Files\Sony\VAIO Gate\EN-US\VAIOGateShellExt.dll"
del /F "C:\Program Files\Sony\VAIO Gate"
And viola!
Anything else I can help you with?
