I am not a Dell Employee
Dell forum member since 2002
Home Built PC with Gigabyte GA-Z77X-UD5H motherboard, i7 3770 CPU, Windows 7 64 bit Home/Win 8.1. SSD drive. Sonar X3c 64 bit Recordng Software.
Member of Nashville based R.O.P.E.
If you have some software with specific port numbers (sounds like "old" software too, not Win XP compatible), only plug in the ones you want to use first and let them get assigned the useable numbers and then after you have that working, then physically connect whatever else you have.
BTW, I'm not 85, but I am retired (and in Florida in a housing development with mostly retireees).
I worked in Computers for many years until I retired and Windows XP, to me, is the best Operating System Microsoft has come out with - and I've worked with Microsoft Products since DOS 2.