funkelt - As Chuck has already mentioned - your roses can very definitely be saved - however as the best treatment very much depends on what type of rose it is and as it is very hard to tell from your pictures - whether it is a hybrid tea or floribunda gone wild or a standard that is just a bit unruly - wondered if you know which one it is.
The reason being that if it was a hybrid tea or floribunda rose that has never been pruned - it would look much like the one in your photo - with all the growth at the top - which is not where it should be and the best way of reviving a rose like this - would be to cut the whole rose back so that the main stem was roughly 30cm in height - as this would allow the rose to branch out at a lower level and become more bush like - as well as give it more energy to produce new shoots and blooms - whereas if it is actually standard rose that you have which is meant to have growth at the top - it would be best to first take out all the dead wood and any weak or spindly branches and then cut all the remaining branches back by at least half
As to what the plant is in your second picture - am thinking that it looks very much like a Robinia Pseudoacacia - which is a very attractive smallish tree and definitely one that I think you'll probably want to keep - as even though there are many, many different varieties of these trees - they all look stunning from an early age