I agree with illig about deleting the vendor.xml file. But you would be better off using the apploader.exe file found in the same directory as vendor.xml. Also, disconnect you intennet connection when doing this.
When you are done, use the phone to dial *228, 2 to update the netowrk and for good measure, resend your service books.
This may seem like a lot, but it is a very reliable method. 73