This is why ISP always states “up to 2meg/10meg broadband” etc, like mentioned this depends on differing factors, time of day etc.
Use something like
Speedtest.net - The Global Broadband Speed Test
This will give you a safe indication of your up/download speeds. If you still find that things are not as they should be, check your WiFi card has the latest drivers (just so you can tick it off the list).
I myself am on 10meg from Virgin and get download speeds from 620mbs down to as little as 5kbs depending on who I am downloading from. Don’t forget that the speed does not just depend on your download capability but there upload speed and bandwidth. These can dramatically differ between times of day, also like just mentioned, if you’re running something in the back ground like updates. (This is a strong possibility with you just starting out with a new laptop) Windows up-dates can really slow things down till there complete. Vista SP1 is a good example of this.