runtime error 91 issue

When I run the macro from my pc (windows XP, Office 2007) I dont get any error but when Its run from a Windows 7 machine on Office 2010, I get run time error 91, Object Variable or With Block Variable not set.
Im not sure why this is because the variable is set... but here is the macro.

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I did notice an issue with the last section... but I copied that part from another website so I am not really sure what it does or how to fix it.

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the Set IE = .Item(0)
feels wrong, but im not sure what it does. It should detect if an internet explorer is open (I think) but im not sure what I should replace it with in order to open it.

im not sure anyway, just a guess. If that isnt the issue, im not sure what is.

So there was a problem with this:

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however im not sure why because im not sure what it does. Could anyone explain what this actually means?

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is what I said in red correct?