how many discs is university

[jasam]

hi can anyone help me i just bought the sims2 university expansion pack,when i got it home and tried to install it it said to insert disc 2 however there was only one disc in the box.i took the game back to the shop where i bought it brand new and they said as far as they know it only has one disc they told me to try puttin disc 2 of the sims2 in instead and they changed the disc for another exact same one .i tried this and got the same thing itstill asks for disc 2.t does say disc one on the disc i have so surely there should be 2 discs not one please help as the shop refuses to give me my money back or anything because it is a pc game and they say i cud have put it on my hard drive which is ridiculous as i have only one disc . {no}