Slow to sync on iPhone 4 on one PC only

Hi
We have two Windows 7 PC's, two iPhone 4's and one old nano.
Both iPhones and the nano sync perfectly on the first PC.
On the second PC (new W7 build) the nano is OK but the iPhones are so slow to sync music.
Itunes appears to stop, v low cpu activity.
The USB ports are OK backing up in itunes and for transferring 100s of Gb to and from an external disc.
Tried cables & ports without joy.
Cannot explain why nano is OK and iPhones are not.
Any suggestions most appreciated.

I have solved this problem by installing an £9.99 internal 5 port USB2 PCI card.
Even though normal syncing speed has now returned I am still at a loss as to the root cause of the problem but based on the testing and analyis done I would bet my money on a problem with the Apple USB driver.
It was working before the latest iPhone4 OS and iTunes updates and not working after.
I guess I will now never prove it

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