Hello. I had the same problem with the same brand of router just last week. Here's what I learned and ended up doing after reading different threads on different forums. First, I updated the drivers on the adapter in the 9750. These are available at MSI if you drill around in their downloads (I'm assuming you have the default MSI wireless adpater in your 9750). Then I updated firmware on my Linksys router. If yours is new you probably won't need to do this. Next is to clone the MAC address of your controlling computer (usually a desktop) to the router. This lets the router access the Internet through your modem. Most important is to setup MAC filtering on your router to accept your notebook's MAC address. In your Linksys setup pages, in the wireless tab look for the wireless security tab. In there, enable MAC filtering, then click to set filters. Make sure your 9750 is on and the wireless card is enabled. The router should be able to locate it and you can select to allow that address in the list for your router.
Go to the Linksys customer support website, where there is a wealth of helpful troubleshooting pages. Search for "set up MAC address filtering" and you'll get much better instructions than what I just wrote, and probably all you need. Also vist this link at Tech Support Guy
-- really helpful.
Hope this works for you.