Thanks to everyone who has contributed to my thread.
I purchased Copytrans and successfully re-populated my iTunes library on my main computer using their programme to transfer all my music on my iPod Touch to my desktop computer.
Copytrans is a dream and was worth every penny (£12.51p) to resolve my dilemma.
Once my music was back in my iTunes library, I made sure I copied everything to my external hard drive before changing the automatic synching process to manual synching.
As a newbie to iTunes, iPod Touch and iPad2, and with the problems I have experienced, I think I would have preferred Apple to set the default position on my new gadgets to anything BUT automatic synching. At least that would give new users a chance to familiarise themselves with the all the processes before they were automatically synched.
Fortunately for me I didn't lose all my music on my iPod Touch. I've now populated my iPad2 with my music collection and am relieved everything got sorted out in the end.
I still wish iTunes was more user friendly and that Apple could have provided me with the same service as Copytrans in transferring information from IPod Touch back into iTunes.
Copytrans is definitely my 'Knight in Shining Armour' who saved the day for me!!!
I'm smiling again.