Well my question is' can I simply click the (Terminate) button for each of these provider modules under provider actions?

Network Shield is HIGHLY recommened, since it:

Network Shield is a protection against known Internet worms/attacks. It analyses all network traffic and scans it for malicious contents. It can be also taken as a lightweight firewall (or more precisely, an IDS (Intrusion Detection System).

Network Shield protects you from internet worms that spread themselves via various security holes in your system. Typicaly these kind of viruses don't infect files but instead they attack running processes on your PC (either Windows components or some server programs like SQL Server, IIS etc.). These kind of attacks are not easily catched by ordinary antivirus during file or mail scanning. It is not a duplicate work with Standard Shield.

Basically, it covers all Internet worms. Such as Win32.CodeRed, Win32.SQLSlammer, Win32.Blaster, in32.Welchia (Nachi) and Win32.Sasser.[/i]

I seems to me that it would be a good idea to set the Sensitivity to High instead of Normal on Network Shield, you agree?

I've did that in the past myself, with no ill effects but then again Avast never warned me of anything either. I would think setting it to High would increase the chance of a false positive. I have all the shields set at the Normal level.