iTunes crashes when I connect my iPhone 4S

This is a case of one laptop being confused with two different iPhones.

I had no problem using iTunes with my iPhone 4S on my Win7 laptop.

The other day, I had connected my wife's iPhone to my laptop to transfer some files.

It didn't work, so I gave it back to my wife. Now, I connect my iPhone and iTunes crashes.

It opens up and start to quickly scan the library music files and come to a freeze. All these happens in less than 3 seconds.

An error message comes up saying it will shut itself.

I have visited a local Apple store and they suggest me to uninstall iTunes and other apple applications, but no luck.

They then had no clue how to fix this.

It appears that somewhere in the laptop (win7, hard drive, some system folders, etc...)

it perpetually holds some sort of iPhone or iTunes links or vestiage. This is why it comes up even after uninstalling the iTunes.

I don't want to format the hard drive just for this.

Anyone had this problem or somthing similar??

if so, could you help me?

I don't want to format the hard drive just because this.

I'm so frustrated.

Thank you.