Hello I am one of the other experts here at Just Answer.com
You can check your model based on this link here http://support.apple.com/kb/ht1353
I do have a couple of question
1) I see you are using windows 7 are you using windows 7 64bit or windows 7 32 bit?
2) What version of itunes are you using currently? Is it the latest?
Thanks these will help me solve the issues.
Ok Sounds good. Glad to hear that its working