I would try to install again. Sounds like you maybe lost your connection during the install and it didnt go back to the installation? At any rate, there are some important security updates in SP2 you should have. Plus, as Skuzzy said, soon they wont support any release of XP that hasnt updated.
As for the bug thing, I seriously doubt its a bug specific to your computer. SP2 has been out for quite some time. It may require that you update some drivers or something, but it won't be "incompatible".