Bitcoin Qt on Windows with watching wallet on USB

[xcsler]

I am wondering if the following setup is possible:
Have the blockchain/Bitcoin-qt on my Windows work computer hard drive with an Armory watching wallet on a USB stick.
(I have been able to download the Bitcoin-qt client on my work computer but I don't have privileges to install Armory hence my problem)

1.Does the USB need to have an OS on it? If so, would a Linux OS work?
2.Is there anything I need to change to have the watching wallet know where to find the blockchain on the hard drive?
3.If so where is the change made?

I am not really tech savvy as you can tell from my questions. Thanks for your help.