Presario c500 drivers

my sound is not coming and d sound card is installed

Sir as you have not specified the exact model no (like c500EA) and the operating system you are currently using so it will not be possible to give the download link for the drivers.
But I'm giving you the HP's link where you can download all the drivers for your Compaq Presario C500 series of notebooks. There you are just required to specify your exact model no. and current OS and then you can download the required drivers.
http://h20000.www2.hp.com/bizsupport/TechSupport/ProductList.jsp?lang=en&cc=us&prodTypeId=321957&prodSeriesId=3318986&taskId=135

84 products match your search, of which 25 are listed below. Look at the label on the bottom of your laptop, then select it from the list. On the next page select "Software and drivers downloads". Then select your OS:
http://search.hp.com/query.html?lang=en&search=++&qt=presario+c500+&la=en&cc=us&charset=utf-8

Click on this link or copy and paste the complete link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe