Thank you for posting your question.
The computer model you have is actually a V5100 CTO
Step 1. To find the Audio drivers for your laptop go to the Compaq website by clicking here:
www.compaq.com
Step 2. Click on the Support button
Step 3. Select the Software and Driver Downloads radio button
Step 4. Enter Compaq Presario V5100 CTO for the Product Number
Step 5. Click the Submit Button
Step 6. You will then be taken to the Select your Operating System page
Step 7. Being that Windows 7 is not listed, you may try downloading the Windows Vista Audio driver
Step 8. Click on the appropriate Vista OS, either standard or 64-bit
Step 9. You will fidn your drivers under the Audio Drivers section.
Step 10. Download the drivers and run through the setup process.
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