Cursor / Touchpad Issue

I'm completely stunned. I've been using Windows 7 since the early 6xxx builds, now I'm on the latest build and I've noticed a very odd behaviour of the mouse cursor or the touchpad (don't think it's touchpad related)

As always I'm using the one click to open files and folders option, with underline icons only when I point at them setting. And like never before the icons are selected/marked (like for deletion or name change) instantly after the cursor is above them.

To make it more clear; normally when you use the one click you need to point the icon and wait about one second or click for the icon to be highlighted in my case there is no time delay.

It's very frustrating cause when you browse a drive with a lot of folders you can accidentally grab them and move inside another folder on the drive + it is almost impossible to mark/select files or folders for deletion when you're using Ctrl to select a few files in the folder cause when you move the cursor to select another file all the files that the cursor meets on it's way which are not intended for deletion are selected.

It's driving me mad, where to look for a solution?