This is an open-label, treatment protocol for a multi-center study of posaconazole (SCH 56592) 200mg orally four times daily (QID) while hospitalized followed by posaconazole (SCH 56592) 400mg orally twice daily (BID) on discharge from hospital, in the treatment of invasive fungal infections. Approximately 320 subjects have been enrolled at 160 clinical study centers in the US and worldwide.