Why is my loop infinite, and how can I fix it?

I've started learning VBA from scratch this week, but I've been given a task at my internship that's stumping me. I'm trying to match information in two different worksheets in a common column, compare the two rows, highlight cells with differences, and then copy any rows that have differences to a different worksheet. Here is the part of the code that I believe is creating an infinite loop:

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I'm just taking an initial stab at this, but I'd like to know why the loop is infinite and how I might be able to fix it.

I am also aware that, if there are multiple differences in a single row this could create more problems. Let's assume for now that each row only has 0 or 1 differences.

Thanks

Thanks everyone for the quick responses. I'm back home now so I won't have access to the excel files until tomorrow morning. I'll take a look at it again then and post here if necessary.

Good catch FortySixAndTwo, I had previously been using different variables for this code and just forgot to change that part. Thanks.

Also, I like your signature

Alright, so I've modified the code a bit. I got it to work this way, having the program only look at a single column (I'm only running 42 iterations to make it go faster for now):

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But I'm not sure how to get the code to iterate through each cell in a row once a difference is found, aside from writing a duplicate line for each cell in the row...I've tried this :

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and it runs without error, but none of the rows with differences are being copied over.

That's the problem, I'm working with confidential info and, being an intern, I'm not sure what I can and cannot do regarding uploading things to the internet.