Epson V700 Scanner Driver Win7 x64 SP1  

I have a new HDD and have installed Windows 7 x64 with SP1 on a desktop.
I have connected the scanner directly to my desktop via USB (I read on the Microsoft site that MS no longer support firewire.)
I have downloaded the latest driver from the Epson site and get the error message that there is an error and cannot continue. I downloaded the file again, but still get the same message. I tried then original Epson CD, and still the same message.
I tried to trick it by going into Device Manager and installing the driver, still same message.
My laptop has Windows 7 x64 so I installed the Epson driver on my laptop, no problem.
Cannot understand what to do on my desktop.
I contacted Epson, but all they can tell me is that I need to go to Services and Restart, and if that does not help, it is a Windows problem.
Contacted Microsoft and they cannot help me and tell me to contact Epson.
I am desperate for help, please.

The scanner is connected to the desktop via USB. I tried other USB ports and get the same error message, as initially I thought something may be wrong with that particular USB port.

I am using my laptop. It is my desktop that has the scanner problem. I have installed the OS on the desktop quite successfully. The problem is getting the scanner operational.

Thanks for your help, much appreciated. Unfortunately I still get the same message "An error occurred during setup. Restart your computer, then run setup again." I have wiped the drive (which takes hours) and started again installing the OS, this time without updates in the hope that it is an update that is causing then problem, but still the same message.

I also tried a previous version of the driver; but still no luck. Cannot work this one out.