wont come out of restore mode?

While downloading ther latest update my ipod suddenly went to a black screen with a usb pointing towards an itunes symbol and is stuck in recovery mode. Ive had advice from the online helpers on the Apple website and they recomended uninstalling itunes and redownloading it again, turning off anti virus software. Both didnt work so he said its best to come into a local apple store to fix the problem. They gave me a new one as they said it was taking way too long to restore on their laptops. As soon as i got home and connected it to itunes, the same thing happend again :s. I went back into the Apple storte and he managed to restore it perfectly fine. This time it lasted me about 2 months and had no problems when conecting to itunes. I connected it to itunes today and the same thing has happend, with it being stuck in restore mode. How can i fix this problem myself at home rather then going 30 miles to get to my nearest Apple store!??!!