Urgent - Hp AoI 7410 with Mustek A3 scanner: Problem!

[Alessio B.b.b.]

[crosspost from comp.sys.hp.hardware]
Hi!
Some week ago I've buy an HP OfficeJet 7410 and a Mustek A3 flatbed
scanner.
I've connect the OJ 7410 to my local network throug his lan port and
after i've installed the driver and the software ship with it.
Finally I've search on HP support site and I've installed all the
available update.
I've try all the funcion and the OJ 7410 work great!
More over I've installed the Mustek A3 Flatbed scanner and from now I've
experienced many problem!
I explain myself better...!
With all the two peripheral istalled (HP over ethernet and Mustek over
USB) i'm not able to use the scan funcion!
For example, in adobe photoshop or in whichever other program in which
it is possible to use scanner, i can't choose or select from which
source i want to acquire.
I can only use the last peripheral i've installed.

I'm sure that, singularly, every pheriper works fine because i've test
it in this condition.
I think that, probably, is a twain limitation because the only funcion
that cause conflict is the scanning option.
Any one here know a trick to bypass my big ("MY" BIG ;-) problem.
I hope in your reply!
Thank you very much in advance!Alessio
(please excuse for my bad english!)

 

[CSM1]

[crosspost from comp.sys.hp.hardware]
Hi!
Some week ago I've buy an HP OfficeJet 7410 and a Mustek A3 flatbed
scanner.
I've connect the OJ 7410 to my local network throug his lan port and
after i've installed the driver and the software ship with it.
Finally I've search on HP support site and I've installed all the
available update.
I've try all the funcion and the OJ 7410 work great!
More over I've installed the Mustek A3 Flatbed scanner and from now I've
experienced many problem!
I explain myself better...!
With all the two peripheral istalled (HP over ethernet and Mustek over
USB) i'm not able to use the scan funcion!
For example, in adobe photoshop or in whichever other program in which
it is possible to use scanner, i can't choose or select from which
source i want to acquire.
I can only use the last peripheral i've installed.

I do not know why you can not select the TWAIN you want to use. If both
TWAIN are installed on your computer, Photoshop has a select TWAIN.

File>Import>Scanner Name.

Irfanview 3.98 (free download Windows only). http://www.irfanview.com
File>Select TWAIN source. Then File>Acquire/Batch Scanning.