i want to sync my ibook to my windows pc how do I do this?

If you mean copy the contents of the iBooks app on your phone to your PC, then you can connect your iPhone to your computer's iTunes and do File > Devices > Transfer Purchases to copy your iTunes purchases over to your computer's iTunes - that will copy PDFs and epubs that are in the iBooks app, not just actual ibooks. Is that what you mean ?

Unless the ibooks are free ibooks, or they don't have digital rights management them (most paid-for ibooks have DRM), then you won't be able to read them on a PC