Installation problems

[boeketjebloemen]

I came back from a large break from playing the sims 2. I'd uninstalled all my sims 2 expansions from my computer, pretty much removed everything sims2-related.
A few days ago, I felt like playing again, so I installed the sims2 base game, and OFB, Seasons and Free Time. Everything worked perfectly fine.
Today I felt like installing some more EPs, and tried installing Uni, NL and Pets. Uni seemed to install just fine, except at the very end, when you're supposed to get a screen saying it was successfully installed. I didn't get that screen, and my computer froze, I had to press the reset button to get it going again.
I hoped it had still installed just fine, since the rest of the installation didn't give any errors. So I installed NL after that, and got exactly the same thing. Then I tried Pets, and low and behold, that installed perfectly fine and the comp didn't freeze.
After this, I tried playing the game, but it doesn't register Uni or NL as being installed. They do show up in the Start Menu and Program Files. I have Windows XP.

What went wrong?!?
Should I have tried to install them in the correct order instead of trying uni, nl & Pets after OFB, seasons and FT?
Us there a limit to how many times an EP can be installed? Because I share Uni and NL with my best friend, and all the other EPs are 100% my own. So Uni and NL have been installed more often than the others...
Maybe it's because Uni and NL are CD-rom versions and all the others are DVDs?

Is there anyone who might have any clue? If you need more info, please let me know exactly what you need, and I'd be glad to give it to you.

[EKozski]

A rule of thumb is, install them in order.

Whenever I need to uninstall my games, I install them in order. i.e. Base game, University, Nightlife and OFB.

It's a habit I picked up from having all the Original Sims 1 games.

[BlooM]

It shouldn't matter if you install them in order or not but it is wise to do so.
I think the problem lays within the patches that come with every new EP you install.
Every EP has a patch in it that updates previous EP's that are installed and i think things got screwed up there.

[boeketjebloemen]

Thank you both!
I think I'll try uninstalling then re-installing in the correct order. I'll let you know the outcome

EDIT: It worked! Thank you, again!