USB flash drive/ DVD drive problem

Hello guys
I recently ran into a very weird windows 7 bit problem after installing it on my desktop. I cannot copy large files/ holders into usb flash drive or write large files to cd/ dvd. The copying/ moving process would stay on for about 5-10 seconds then freezes then I get an error message. That is:
H: refers to a location that is unavailable. it could be on a hard drive on this computer...
I have all the latest drivers.
And windows/ nero 9 can't use my dvd drive to burn files.
Some info about my system: AMD X4 630 CPU. MSI KA780G (AMD 780G chipset) mobo. I have 2 sata hdds, non raid mode. The DVD drive is IDE. 4gb ram ddr2 ram. windows 7 64 bit.
Any help would be appreciated, thanks

You could go to your driver page on the MSI site - there is a Ati system driver that might help - have a look as there is others also that might need updating -
MSI Global ? Computer, Laptop, Notebook, Desktop, Mainboard, Graphics and more

You might have a look at this fix - I don t think its for your board, but Im unsure - post back, as this would be helpful to know.
You encounter problems when you move data over USB from a Windows 7 or Windows Server 2008 R2-based computer that has an NVIDIA USB EHCI chipset and at least 4GB of RAM

thanks for the help, it's a really close to what my problem is. after i installed it i thought i was fine, but nope

anyone?