If this is a work laptop, does the company that you work for have a IT department? Most likely seeing as you are just the user of the laptop, there is likely to be someone in your company who has...

A thing to look for:
Goto Control Panel -> Sounds & Audio Devices -> select the 'Hardware' tab.
Is there anything written in the Hardware box? If there is click on it and press troubleshoot. Then...

Might be an idea doing a system restore if neither of the above options help you. But that is a last case scenario. I would as both Odie and Boblarson suggested is too check all your drivers for...

Well for another check of your systems RAM, you could use Crucial Techs scanner to see what RAM you do have to see if it a matching pair.
Scanner can be downloaded from here:...

Can you connect at all through the router onto the internet? Are you able to connect through an Ethernet cable?