|It's got nothing to do with a virus.|
You get a white progress bar when Windows is coming out of hibernation mode, as opposed to normal startup.
If you shut your PC down properly instead of choosing "Hibernate", you won't get the solid white progress bar when you start up, although it will take longer for Windows to load (which is why many people use "Hibernate" instead).
Click the "Start" button and choose "Shutdown" instead of Hibernate.
message edited by phil22