swap / Windows 7 x64

Ab image to DVD is not a good idea anyhow. You should use an external disk. If imaging should make any good sense, you have to do it frequently - and then DVDs are a mess.

This is not going to make you rich - but yes, you can delete them. You have to look for the big chunks.

You never said how much space is taken and how big your SSD is. And did you run one of the programs to find out what exactly is on the SSD.