System halts during boot

When I boot up I have system set to boot from SATA drive.
System OS - XP Professional SP2.
I have two hard drives connected via PCI controller (Silicon Imag
ATA-133 Medley Raid Controller card)
I have four USB hard drives hooked up to a Belkin hub.
Maxtor 3200 USB Device [Hard drive] (500.11 GB) - drive 3
ST340063 3A USB Device [Hard drive] (400.09 GB) - drive 4
Seagate FreeAgentDesktop USB Device [Hard drive] (500.11 GB) - drive 5
Seagate FreeAgent Pro USB Device [Hard drive] (750.15 GB) - drive 6
When booting USB auto configuration passes ok.
Memory check is ok.
Computer hangs after identifying the four USB hard drives.
Windows does not launch.
If I disconnect USB hub system starts without a problem but then
I do not have the hard drives.
I can plug in USB hub after Windows has booted.
Windows then detects them.
Disk Management sees hard drives.
All hard drives are NTFS.
Any ideas how to resolve this issue?
I await your reply.
Thanx


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daveiosys