Microsoft 2003 help!

This past year, I've bought a Toshiba Laptop computer and it's really great so far. In my "All Programs", I see Microsoft section and in there, there is the Microsoft Powerpoint 2003, Mic. Word 2003, Mic. Excel 2003, and Mic. 2003. I clicked on one of them and it said it required a serial number. I had a older laptop from like 2003 and it showed the same thing. On the 2003 laptop, I just clicked cancel and I could access them no problems. So, on this 2007 Toshiba Laptop, when I press cancel, it just exited. I did some research and it said for me to buy it?! I looked under my laptop and saw a serial number.. but only for OneNote 2003. I couldn't use the same one for the other programs. My questions are.. Were the company suppose to download them and let me have them for free with the purchase of the computer? Was the serial number for OneNote2003 suppose to work for other programs? Do I have to go and buy the Program (containing all the programs in one) seperately?

 

They were "trial" versions and yes you have to pay for them unless you are into formatting your computer constantly.

 

How come for my friends, they didn't have to buy the products. Instead, they would open it and when it said to enter in the serial number, they would press CANCEL and the programs would work for them, free of charge.