Root kit - JustanMT

I am new to the board but have been reading about lots of transcriptionists having dropping line counts.  I am an MT with over 30 years experience.  I worked for Medquist for many years, quit when the new group took over.  My line count had dropped by about 30% at that time.  I went to another company and have worked for them since, my line count recovered at first, but for at least the last year or so, it has dropped again, 30% again.  I am 58 years old and am not bragging, but my speed and quality are excellent. I bought a new computer about three years ago because of a virus.  It was built for me by a local company.  They used the programs on my old computer to build my new one.  My daughter has suspected for some time that there was a rootkit on this computer, the reason for the drop in my line count and why the internet is so slow.  She installed Norton on it a few days ago and ran their rootkit scan software and discovered there is a rootkit on my computer, in my transcription program.  My daughter also says that if I try to fix this, my computer will crash, and I can't afford a new one.  Does anyone have suggestions on the best way to deal with this?  I am so appalled that this company that I thought were decent and respectable, is doing this.  I would like to quit but can't afford it.  Thank you for your help.