Sorry if this isn't the right spot for this... but..

Last year I got Sims 2 Holiday edition. It's worked like a charm ever since.
A couple months ago I got the Pets expansion pack. During the install, it suggested I back up my Sims 2 files. I didn't.. I don't care if I never play Sims 2 again. I just wanted a cat, lol.

So yesterday I got the Seasons expansion pack. It gave me the same suggestion. Again, I didn't do it.
Then it got to 10% and said there was an error. Asked to retry or cancel. I retried a few times, then canceled it. The next time it got to 23%. Same thing.
To make a long story longer, lol, I ended up uninstalling Pets, then unistalling Sims 2.
When I tried to reinstall Sims 2, it gave me the same error. I tried to manually copy the files and do the autorun, and that didn't work.
Finally I discovered that the DirectX wasn't on my computer, so I got that, and the install went okay until it was at 77%, on the 4th CD.
I copied that CD manually into a file, then clicked retry, and it worked.
Yay! I tricked it.
So when I got it to load, Pleasantview's color is all messed up, and there are big white squares all over it... Strangetown's ground has weird peaks all over it, and it was freezing up when I was trying to enter a family.
My question is- what's wrong with it? lol.
More importantly- does it matter that that one is messed up? I don't care that it is, because I'll probably never play it again....
But would the Seasons expansion pack work, even if Sims 2 is jacked up?
I don't want to try installing Seasons and then messing something up further.
Any info would be appreciated!
Thanks in advance!