You can share your laptop's connection over Wi-Fi, you're essentially turning your laptop into a Wi-Fi hotspot and connect Your tablet than.
You have few options:
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Use Internet Connection Sharing (ICS): Internet Connection Sharing or ICS is built into Windows computers from Windows 98 to above. An example of Internet Connection Sharing is if you have a laptop connected via wire to a router or modem and then share that connection to a phone or tablet either over the Wi-Fi adapter or through another Ethernet port.
Here is instructions for Windows 7:
http://mobileoffice.about.com/od/internet-sharing-tethering/ht/how-to-share-internet-connection-on-windows7.htm
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You can use Connectify:
Connectify is free software that shares a single Wi-Fi connection over Wi-Fi--no need for a second adapter or for your laptop to be wired to the Internet. It's only available for Windows 7 and above, however. One of the main advantages of Connectify over the above methods is that the connection is more secure--using WPA2 encryption in Access Point Mode versus the very insecure WEP, as the ad hoc networking modes above do. See these instructions for turning your Windowsx laptop into a Wi-Fi hotspot for your phone and other devices:
http://mobileoffice.about.com/od/internet-sharing-tethering/ht/how-to-share-your-windows7-wifi-connection.htm
There is more information:
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How to let Windows 7 laptop provide an internet connection to my Android?
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http://smartphones.wonderhowto.com/how-to/tether-laptop-droid-smartphone-for-free-wifi-354620/