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Some system come with the option to restore default settings so you will not need the CD. Usually there is a utility tool provided by the manufacturer that you can use within windows to restore factory settings or by pressing alt+F10/F11/F12 at the startup menu, and this will take you to restoring the factory settings. If you have not got the utility installed or there is no partition with the default settings, the following link click here (HP owns compaq so the link will take you to hp website )will take your where you can download this utility for your system. This SoftPaq contains an InstallShield utility that allows the user to restore the original registry defaults for the Compaq Evo N620c. These system default settings include the the default Power management settings. You might have to free space by deleting stuff and uninstalling unnecessary apps it is not exactly formatting but you have no recovery CD and no Partition that includes the factory defaults then I guess it is not a bad option. By the way Your laptop will have the Authentication key for the operating system of your PC at the bottom of your laptop this I do not know how useful that is but it was worth mentioning good luck
You can download the drivers from the Compaq/HP WEB support/download page. Make sure you select your model laptop and the XP or Vista Windows version of the drivers you require and install them. Click on this link to download the drivers: - www.compaq.com/country/cpq_support.html
Its the problem with ur driver. If u got ur compaq cd u can find it there.
right click my computer, properties and device manager..u can see sound card with yellow marks and from there u can install driver