Hello Laura! Thank you for your question. I am a licensed computer professional with over ten years of experience, and I will be assisting you today.I'm sorry. What's the model of your notebook? Does it have windows xp, vista, or 7, or 8?Can you please download and run the Windows Validation Components fix at the website below:http://www.microsoft.com/genuine/validate/DownloadValidationSupport.aspx?displaylang=en
Note: if it asks for a product key, please check at the back/bottom of the notebook.
If it does not work, please try:
1. Click on Start->All programs->Accessories->Run... (or click on Start, Run...) then type rsop.msc and then click OK. It'll open RSOP (Resultant Set Of Policy) window.
2. Then go to: Computer Configuration/Windows Settings/Security Settings/System Services
3. In right-side pane, look for the item "Plug and Play" service, and check its Startup type option. It should be set to "Not Defined". If its not, double-click on it and set its Startup type to "Automatic".
4. Go to Start->All programs->Accessories, then right-click on Command Prompt, then click on run Administrator, then type:
gpupdate /force, then press Enter key.
5. Restart the computer, and check.
If that still does not work, please try:
1. Click on Start->All programs->Accessories->Run... (or click on Start, Run...), then type regedit then click OK. It'll open Registry Editor.
2. Now go to following key:
3. Right-click on "S-1-5-20" key and select "Permissions...". It'll open a new window.
4. Select "NETWORK SERVICE" in user list and check "Allow" box given for "Full Control" permission. Click on OK button to apply the changes.
NOTE: If "NETWORK SERVICE" is not present in user list, click on "Add" button. Now type Network Service in "Enter the object names to select type" and click on "Check Names" button. It'll detect and confirm the username. Click on OK button.
Please click on the Reply to Expert tab below, and reply back to me, so I can help further if there is still any issue. If you are stuck or you'd like to, I can connect remotely to your computer and fix the issue directly for you (that is if the internet still works on your notebook.) Thank you.