You can remove anything you don't use, pretty much. Those two HP ones are most likely bloatware, as you said, but double-check to make sure they're not required for special features of your PC. It may be better to just uninstall them completely.
The Java one, bearing in mind we can't read the full name and path, is probably the updater program. You can disable this, but obviously then won't receive any updates for Java unless you have something else checking for them.
The Synaptics one I usually leave on - it provides functions for the touchpad that prevent "palm-clicks" and aid with scrolling and things like that. The IDT PC Audio will be sound card related - best to leave that running for sound enhancements. And "Microsoft Se..." I'm assuming is Microsoft Security Essentials, so leave that on, as you have
Basically, if you're not sure, leave it enabled and do some research into what it is and does.