It doesn't sound to me like you want to be a tech. You want people to bring you a computer and you run a script and your done. Being a tech is about figuring out the problem. Such as in a virus removal. Running RKill then MBytes and SAS, will only get the weaker viruses. Figuring out the virus, removing it from the registry, fixing the registry, finding out if a rootkit is involved, disabling the rootkit, unhooking if required. This all takes time. Yea I build computers (or should I say reimage) that I sell, 20 at a time, but you just can't do that with virus removal. Well unless you just nuke and pave all virus removals.
There are some real tough, stubborn viruses out there. You can't expect to spend 3 min on the computer to start a scan and be done with it.
What do you do when you can't get anything to install, or you can't run any exe programs? What about when the registry will not open? Ever look at the Hijack This logs? If your scans come up clean do you believe that you are actually virus free or do you test the computer to see if there are any other symptoms? All this stuff takes time.
There is no - 1 solution will remove all viruses.
I know this one pizza tech that that had the model, Mbytes for virus removals. ERD Commander for other software problems. If those 2 didn't fix it he would nuke and pave.
As far as hardware issues, he would replace the hard drive, power supply and the ram. If that didn't fix the problem, he would tell the customer that it was the motherboard and it would be cheaper to buy a new computer.
He didn't even charge $24 for each repair. And he was not a tech.