Laptop doesn\'t recognise external hard drive



I just bought a store n go portable hard drive USB 3.0 - 1TB model no 53039

My old computer is a Dell Core 2 Duo running Windows Vista - the Verbatim HD connected via USB 2 without any problem and copied all the files that i needed to it.

My new computer is an ASUS Core i7 running Windows 7 home primium 64 bit version. when i connected the Verbatim HD to the new computer, the computer does not recognize the Verbatim HD.

Please tell me what to do