My computer won't connect to my home internet?

About a month ago, i upgraded my internet to be unlimited. After this upgrade, my lenovo laptop was able to connect to it for about a day. Then, it suddenly stopped sencing its existence after a day or so. This continued for about a month and i got my internet back for about a week, now i have no internet again. This is making schoolwork difficult and all other devices connect just fine it is only my laptop.

If everything else connects to the Internet other than your laptop, the problem likely is with the laptop Wi-Fi adapter or configuration.

The first thing I would try would be rebooting the laptop, this will reinitialize the wireless adapter. If you still can't connect, reboot the router and then the laptop again. If this fails, go into device manager on the laptop and remove (uninstall) the wireless network adapter. Reboot or do a find new hardware from the menus and Windows will reinstall the adapter and drivers.

If your laptop Wi-Fi adapter is bad, you can get a USB Wi-Fi adapter like this http://amzn.to/...to/1PsANbo for under $20.

Check if laptop can connect to internet in other place like your friend or public place.
If it can't problem in laptop.
Upgrade Network driver, if it won"t work use USB network adapter.