PS CS4 has problems since reinstall

I had to wipe my hard drive. Photoshop CS4 has had problems since I reinstalled it.

The Move Tool's cursor is a funny bar that looks like heiroglyphics (It seems to be made of a strange assortment of pixels, divided into roughly three sections). I tried to take a screenshot, but that apparently makes the cursor disappear.

When I select something with the Square Tool, I cannot deselect the area by clicking. I have been able to deselect it by clicking with the Lasso tool. When I click with that, the cursor becomes four dots in a line.

When hovering over a layer in the Layers pane, the cursor becomes a third sort of line, white rectangles with black borders.

I have reinstalled the software two additional times, but the problems recurred. I am running Windows 10 64-bit.

Has anyone seen anything like this? PS worked fine before the first reinstall.