"Run-time error '9': Subscript out of range" in some computers!

Hi friends...
I have a question & I would be thankful if you answer ASAP....
Why does this code run in some computers and it errors in others ????

this is my code:

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My guess would be that some computers require "book1.xls" (or .xlsx .xlsm) while others will accept "book1"

Another reason why this error would come up is if there are multiple instances of excel. If the workbook with the code, and "book1" are open in the same instance of Excel the code should work, but if "book1" is in a separate instance then you would also get that error.

See if this would fix your issue:

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