Iphone 3G on windows 7 (64bits) shows as unknown device

HP Pavilion tx2500 Notebook PC
ADM Turion X-2 Dual core
Windows 7 - 64Bits
I downloaded the latest version of Itunes and haven’t been able to use since
Every time I connect Iphone to computer, PC recognizes (it shows on Portable devices)
but somewhat shows also in another devices (unknown device) and Itunes doesn't recognize or even shows anything.
I uninstalled and reinstalled Itunes and all apple software (Bonjour, QuickTime etc) about 15 times every way I could imagine.
I extracted files (usbaapl64). I tried to update drivers with no success.
I uninstalled Anti viruses, scanned HD, updated some video/sound drivers
It works on my husband’s computer (another HP)under windows Vista 32bits but it’s not working on mine for the life of me.
I can’t figure it out what its causing the conflict and would appreciate any suggestion
I do not really want to try to jump using the restore since last time I did it I had a hard time to download/update my contacts and settings and ended up having to download MobileMe
Pls help

todays update
It got worse before got better
I uninstalled and reinstalled Itunes a couple more times. I even tried to install a 32bit version since task manager shows Itunes 32*exe.
I finally gave in and restored Iphone to factory settings and then my iphone could only call 911 (emergency calls)
I try to connect again to restore it but it didn't work. I tried the DFU and got a error msg "error-message-0xe8000001"
I researched the error msg and found something about USB2.0. I went to HP site and downloaded an update for some drivers and voila
right now iphone is being synchronized
hopefully I won't have any problems with my contacts like I had last time
this happened to me

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Iphone 3G on windows 7 (64bits) shows as unknown device

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