Heck, thats the good news! It means that your cable is fine and that your PC recognizes your iPad (you'd have worse trouble if the PC didn't recognize it while plugged in).
When you first plug in the iPad, do you get a Windows Explorer window pop-up? If yes, just "x" it out to dismiss it and then see it iTunes can see it. If you close the window any other way, that may be an issue...
If that didn't work, try a couple of things:
(1) Plug the iPad into a different USB port, preferably one that is directly on the computer (not a USB hub or dock). Wait, perhaps for a long time, until you hear the connection noise. Connecting it to t different USB port forces the PC to check and perhaps load the device driver. Again, this may the a while, just don't unplug it, give it a chance to work
(2) See if you can reset or restart the Mobile Device Driver. To do:
(a) Open "run" from the start menu, and run "services.msc"
(b) Find "Apple Mobile Device" service
(c) In the "status" column it will tell you if it is started or not, and the "startup type" column will tell you if it will start automatically when windows starts. Set the status to "started" and the startup type to "automatic". To do this
(1c) Right click on this process, and then click on "Properties".
(2c) In the "general" tab find the "startup type" drop-down arrow menu and make sure "automatic" is selected. Select it if it is not.
(3c) Also in the general tab check the "service status". If it does not say "started" then click the start button
(d) Then, at the bottom of the properties window click "apply"
See if any of that helps.
Marilyn