The Sims 2: Ultimate Collection includes the original game along with all expansion and stuff packs.
Base game:
The Sims 2
Expansion packs:
The Sims 2: University
The Sims 2: Nightlife
The Sims 2: Open for Business
The Sims 2: Pets
The Sims 2: Seasons
The Sims 2: Bon Voyage
The Sims 2: FreeTime
The Sims 2: Apartment Life
Stuff packs:
The Sims 2: Family Fun Stuff
The Sims 2: Glamour Life Stuff
The Sims 2: Happy Holiday Stuff (includes Holiday Party Pack)
The Sims 2: Celebration! Stuff
The Sims 2: H&M Fashion Stuff
The Sims 2: Teen Style Stuff
The Sims 2: Kitchen & Bath Interior Design Stuff
The Sims 2: Mansion & Garden Stuff
Minimum Requirement:
OS: Windows 98/98 SE/Me/2000/XP/Vista (if patched)
CPU: 1.8 GHz (2.4 GHz for Vista and above)
RAM: 512 MB (1GB for Vista and above.)
Disc Drive: 8x CD-ROM/DVD drive
HDD: 3.5GB free space
Video: 32MB DirectX 9.0 and T&L compatible
Sound: DirectX 9.0 compatible
thanks