What from SQL Server in the event log makes you think that is why you are having a slow bootup? Your best bet, before uninstalling it, is to stop the SQL Server service and set it to manual start. Restart your laptop and see if that is truly better. Otherwise, you might end up uninstalling this, screwing up and application and then you'd have two problems to fix.
Is this a corporate image loaded by someone? Do you have the actual install media for the OS or just a recovery disc?