Using Firewall software requires some level of technical knowledge.
If you want to use the least amount of knowledge- I'd recommend Norton Firewall. More experienced users can try Zonealarm pro and the financially challenged would go with Zonealarm - the free version...
The rest of them I wouldnt trust...
Port scanning is usually connected to attempts to hack into your system or use it for purposes other then you intended it for...
Allowing remote access to your computer should be done very carefully...
If you want to use the least amount of knowledge- I'd recommend Norton Firewall. More experienced users can try Zonealarm pro and the financially challenged would go with Zonealarm - the free version...
The rest of them I wouldnt trust...
Port scanning is usually connected to attempts to hack into your system or use it for purposes other then you intended it for...
Allowing remote access to your computer should be done very carefully...