computer not recognising ipod touch even after reinstaling itunes
Did you do everything here:
iOS: Device not recognized in iTunes for Windows
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
New cable and different USB port?
Runs this and see if the results help with determine the cause
iTunes for Windows: Device Sync Tests
Try on another computer to help determine if computer or iPod problem
Retrieving data ...