Windows 7 did not recognize my Seagate Portable Hard Drive

Hello,
On my Toshiba laptop, Windows Vista recognizes easily my Seagate Portable Hard Drive STBU1000102. But my HP Laptop (with Windows 7) cannot recognize my Seagate External Hard Drive. Normaly the model STBU1000102 should work on Mac and PC. I went on Computer
Management of windows. On vista, the disk appears correctly but on windows 7 (Universal Serial Bus controllers), the icon of USB appears with a yellow mark. When I tried to install it on windows 7, the driver is found but I received the message "Access
is denied".
Could you help me ?

Hello,
I thank you for your help. But up to now the problem is not solved.
I forgot to add that I have in Device Manager the following message :
The drivers for this device are not installed. (Code 28)
I made a search on the Internet about the message "Code 28". I tried the tests proposed. No solution.
But I learnt that one of the cause of "code 28" is a wrong driver.
Then I doubt now about my understanding of this message of Seagate about the device :
This software allows you to mount the NTFS partition on a GoFlex drive as read and write (NTFS would normally be read only in MacOS), so the drive can be used to drag and drop files
between a computer running MacOS and one running Windows. This image file includes an uninstall file that was not included with some early drives.
And even Amazon writes :
Install the pre-loaded NTFS driver for Mac and use the drive interchangeably between PC and Mac computers without reformatting
Does that mean that the driver of this device has to be installed on MAC OS ?

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