I am following every walkthrough I can find and I cannot squeeze between the first moved box and the wall. Can anyone give me any pointers??? It's driving me crazy!!! I played this game back when it came out and never had a problem but I can't do it now. Stuck this far in is quite depressing! Thanks for your help!

The best thing here is to push once and let go of the d-pad/arrow key. Regina will keep pushing until moving exactly ONE block space and stop. If once is not enough, do it once more. If two doesn't allow you to move through, you're moving it wrong.