Hi, Sunflowergal!
I'm not a computer expert by any means. So, if this doesn't help, then maybe another Simmer can help.
It might help if you provide more information such as what exactly happens when you try to load your University Disc?
Here's a couple things which are from information that I've gotten from other Simmers:
1. Is one of the discs that you are installing a "Deluxe Pack"? If so, then to check to see if you already have Uni with the "Deluxe" or multi-pack. If up do, then the single version won't install.
2. Did you unistall the Uni program from your computer if you had it previously installed? It's easy to miss one if you had the complete TS2 game.
3. According to some Simmers, it's best to install the the EPs and SPs in the order in which they were released. I don't know if this is or could be the problem. But here's the order of release--or order to install the discs:
The Sims 2 (or Sims 2 Deluxe, Sims 2 Double Deluxe or Sims 2 Holiday Edition)
University (or University Life Collection)
Nightlife (disregard if you have Sims 2 or Sims 2 Double Deluxe)
Christmas Party (US) or Holiday Party Park (UK)
Open For Business (or Best of Business Collection)
Family Fun Stuff (or Fun with Pets Collection)
Glamour Life Stuff
Pets (disregard if you have Fun with Pets Collection)
Happy Holiday Stuff (disregard if you have Sims 2 Holiday Edition)
Seasons
Celebration Stuff (disregard if you have Best of Business Collection)
H&M Fashion Stuff (disregard if you have Best of Business Collection)
Bon Voyage
Teen Style Stuff (disregard if you have University LIfe Collection)
Free Time
Kitchen & Bath Interior Design Stuff (disregard if you have Best of Business Collection)
IDEA Home Stuff (disregard if you ahve University Life Collection)
Apartment Life
Mansion & Garden Stuff (disregard if you have Fun with Pets Collection)
4. Just thought of this possibility when I saw another post that you have about getting TS3. Does your computer have enough room for you to add another program such as Uni? (Or, is there enough room on your hard drive?)
I hope that might help. If not, then good luck finding the answers you are looking for.
Lilly
PS The spacing on the EPs and SPs didn't come out right in the post that can be read, so to keep from any confusion, I put a smiley face before each new EP or SP. I hope that makes things clear for you. Oh, I see the smiley faces in the finished post are animated. That's kind of cute.