Enigma Software (Spyhunter) Preloads malware in their program (Snap.do et al). CD willl not install Clearwater, Florida

I have ordered, and paid for, and installed Spyhunter software more than once. The first time they charged me more than I ordered and the program worked very well for one run through. On the second and subsequent tries, the same malware was reported and was supposedly deleted but never was. It continually changed my system operating paameters, ususally in  a different manner every time. I ardered a CD rom the last time, which would not install, and which changed my internet provider from Yahoo to Bing. I have had no stisfaction contacting the company.