removing sync with nonexistent computer

I don't know if my case is unprecedented but i don't seem to find the right answer to my problem.

Early this year I bought an Ipod touch and was not having any problem until I reformatted my computer. Not being a techy person, I simply transfered all my files to drive D and reformatted drive C. Since then, I was not able to sync my ipod properly since it won't detect my computer as the original one anymore. It must have been the itunes program that I reinstalled that it was not compatible with and not the computer itself because it is still the same computer that was synchronized with before.

Is there a remedy to my problem? Can I sync my computer again without going through the process of deleting the ipod contents and reinstalling everything? Do i assume that I will never be able to use the sync function anymore since the orginal itunes program is non existent?