cannot delete music from iphone 5

I have recently downloaded a few albums from itunes via my iphone 5 . I have decided that I don't want all the songs on my phone as it's taking up space.

So I am connected to itunes via pc (running windows 8.1, brand new laptop) and am trying to delete those unwanted songs.

I have been using itunes and iphones for over 5 years and very familiar with processes and such for apple, but for the first time today, I am not able to delete or even sort songs on my iphone via pc itunes program.

*I'm also having issues when I go to close out itunes on my pc. I keep getting the "one or more applications is running scripts...."

Is there some other way to delete music from my phone ?

Thanks

bjb