Q: my ipad is not showing on my computer

An iPad (nor iPhone) is not designed to mount as a drive, it should only appear in 'my computer' on a PC if you have photos/videos on it that you can copy off e.g. photos taken with the iPad, copied to it via the camera connection kit, or saved from emails/websites - do you have any of those on your iPad ?

iPad not appearing in iTunes

http://www.apple.com/support/ipad/assistant/itunes/

iOS: Device not recognized in iTunes for Mac OS X

http://support.apple.com/kb/TS1591

iOS: Device not recognized in iTunes for Windows

http://support.apple.com/kb/TS1538

iTunes for Windows: iTunes can’t contact the iPhone, iPad, or iPod software update server

http://support.apple.com/kb/ts1814

iTunes for Windows: Device Sync Tests

http://support.apple.com/kb/HT4235

IOS: Syncing with iTunes

http://support.apple.com/kb/HT1386

Apple - Support - iPad - Syncing

http://www.apple.com/support/ipad/syncing/

iTunes 10.5 and later: Troubleshooting iTunes Wi-Fi Syncing

http://support.apple.com/kb/ts4062

iOS: “Not enough free space” alert when trying to sync

http://support.apple.com/kb/ts1503

You may need to delete iTunes on your computer and then reinstall.

How To Completely Uninstall and Remove All Traces of iTunes

http://zardozz.com/zz/2008/04/how-to-completely-uninstall-and-remove-all-traces- of-itunes.html/

 Cheers, Tom