ITunes doesnt recognise any iphone since upgrade to 10.5

Question

I am on windows 7 using Toshiba Satelitte L770
I have an iPhone 3GS, my wife has an iPhone 4 and we have an iPad.
All 3 worked fine with the Toshiba on itunes 10.4
I then wanted to upgrade the devices to iOS 5.0.1 (from 4.3) - so iTunes 10.5.2 had to be downloaded first which we did.
Once iTunes was upgrade - the devices were not recognised, only as camera devices but not in iTunes
I tried all of the standard troubleshooting as seen here - http://www.apple.com/support/iphone/assistant/itunes/#section_7
No joy.
On a separate laptop running Windows Vista on a Dell Latitude, I have iTunes 10.5.2 installed.
When i plug the devices in, they are recognised no problem. So this problem appears to be related to the Toshiba only
I removed itunes and reinstalled the old version 10.4 -- this time iTunes gives out to say the version of iOS is imcompatible with iTunes 10.4 - which I think is good, as at least its recognising the iphone is connected.
Once I upgrade to 10.5.2. on itunes again, nothing, doesnt recognise the fact that any of the devices have been plugged in
Help??
What else can I try, cant find anything on google other than what I covered in the troubleshooting requests.

Answer 1

Been having the same issues happening on the same machine as you. I did this yesterday, and so far so good.
1. Restart in safe mode (Hold down shift key when you hear the chime)
2. Under Applications > Utilities > Disk Utilities, select your hard drive on the left column, and click "Repair Permissions"
3. Once done, restart
It's been a day since I've done this, and no beachballs yet (fingers crossed)