Hi there and welcome. Your ABS fault could be caused by a few issues. It might be that you have faulty sensor. Another common fault is the ABS system is the ABS rings. These could either be dirty or one of the rings maybe split, if so this would cause the ABS to kick in even with light breaking. As for the heavy steering, check your power steering fluid levels. It may be worthwhile changing the fluid. Your LED display sounds like you may have a bad earth connection somewhere. And finally as for your winter tyres, not worth the time, you will have to inform your insurance company off the change in tyre type (as this would be considered a modification) and I will guarantee you that your premium will increase. Hope that I have been off some help to you. Tommo