Laptop Dell Inspiron N4010 Audio not working properly desipte of running of audio driver. Why ?

[ashooke]

For last few days its audio giving problem. internet service provider is same at residence and office. i have downloaded audio driver from dell's official site and run it. in office intially on running this driver audio used to work and then stopped totally. At my residence it still works but after running audio driver 3-4 times. same step i repeat in my office also but now it never works. it is something funny. i have talked to number of persons and all say that it has nothing to do with internet. i also agree but none is able to provide reason as to why it works at residence and what is the remedy. i need help.
Windows 7 is installed.