My name is Dhiren and I work for the Social Media and Community Team at Dell.
You will find all avaiilable drivers on our support website. You can visit www.support.dell.com and look for specific wireless drivers by using either the system model or service tag.
funny, both of the "techs" from Dell failed miserably to answer your question. scout_03 got it correct. Dell only provides Windows XP drivers for this model. as a result you will need to purchase a new wifi adaptor for use with Windows 7.