Server Virtual machine

[TonnaCcHio]

Hi guys, I'm Paul
I apologize for my English because it is translated by google.
The base operating system is windows 7.
I have run 6 virtual machines with windows xp and I have each associate:
- Mouse
- Keyboard
- Monitor
The hw pc is assembled:
- CPU i7 4790
- 3x hd 5450 (6 monitors can be used)
- 2 ssd crucial mx100
I already tried with windows 7 and virtual box. Disaster !!! I have huge problems with the management of usb, in particular:
- In the config. virtualbox you can configure the USB ports (all 3.0) to be used for a particular VM but you can not enter letters. While, from what I understand, the addressing of usb windows is hexadecimal then you are limited to using only those with numbers.
- Using the fantastic windows usb hub not to a different address for the hub ports but you will always address 1 for port 1 and so on ... so you end up with more USB ports with the same insidizzo
But in spite of everything I was able to fix the configuration for 4 VM VirtualBox but every now and then by the numbers, and despite the usb port configuration is correct, combines mouse and keyboard to SPAM_SEARCH !!!!
How can I fix?
Thanks guys !!