Virus !!!!!!!!

Tech-Archive recommends: Speed Up your PC by fixing your registry

Hi there gentlemen & women: I have major "Trojan Horse" in my files ,I
cannot get rid!! My Norton software can't do it neither can anything else
I've tied.I keep trying to quarantine which seems to be successful but the
damn thing keeps coming back,I cannot use my excel sofware and it's
infiltrating others each time I clear....Pleez help..Thanks
.