In the DOS v2.x version, you go to the directory with your runs in it and then delete the files using the DOS DEL command:
cd tlink
dir
del run1.ecm
del run2.ecm
del runx.ecm
etc.
Or to get rid of them all:
del *.ecm
In the Windwos version, just open the folder where your runs are stored and then click on the ones you want to delte and hit the DEL key or drag them to the trash can.
Be sure the Key is ON and the engine is NOT running when you calibrate the boost harness. Be sure you are using a 3 BAR MAP sensor (a 2 BAR will not have the proper range).