kellyinkc--Is your new PC an IBM or Lenovo? I would think the maker would provide info on the preinstalled programs (perhaps by email or phone), or maybe the program has a Help option.
I guess you are saying you cannot answer the question "What is it you want to do with PC Doctor? Maybe there is an alternative. " since you do not know what it is supposed to do.
If the PC maker is reputable, I would not think they would put malware on the PC. However, that does not mean it is a useful program to you.