Security Software Reccommendation

I have downloaded a free version of Process Guard software:

http://www.diamondcs.com.au/processguard/

Process Guard monitors otherwise hidden programs and other processes that are executing activities against other programs or processes that may not have been, as yet, noticed.

I have been using it and am very pleased. However, I cannot purchase a licensed full version (with many more features) from the website.

Wilders Security Forums presents information indicating that Diamond CS (the parent company) may well be defunct now, or at least something very similar.

So I am asking folks here if anyone has a suggestion for an alternate software, hopefully even more effective.

 

My own experience is to use Avast as antivirus with the Privacy Expert as firewall and antimalware software. They work quite good together which is enough for me.