Pixels seem rectangular

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1. When I draw a square, same height and width according to photoshop, it comes out rectangular even though the pixel aspect ratio is set to square. 

[JJMack · Accepted solution]

It would be better if you posted a screen capture not a Photo. However, from your Photo it looks like its a Windows issue for the aspect ratio of objects on your windows tasks bar are off as well as all Photoshop objects.

[D Fosse · Accepted solution]

Adjust your monitor resolution in Windows Settings > Display. Your whole screen image is stretched, it has nothing to do with Photoshop.