88A30576-7583-4F75-8136-5EFD2C14ADFF is the CRM package GUID for plug-in packages.
You need to download the CRM 2011 SDK and install it. Then, in the SDK folder, run the tools \ developertoolkit \ crmdevelopertools_installer.exe
Another GUID, 4C25E9B5-9FA6-436c-8E19-B395D2A65FAF, I could not find on the Internet, but I suspect that this is just a plug-in GUID, since I only see this in my plug-in project.
Maxthecat
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