Web read serial number GUID

How to get a unique identification from harddisk, motherboard etc from a web-application. I know that this is not possible to do directly.

I´m working in a company with a lot of personal information and the employees use a web-application, that I have developed in aspx.net, of course with login and https, but because of new rules from the government, this is not secure enough anymore.

So to solved this, the company have decided that we have to make some kind of whitelisting of computer, that means that every computer have to use a unique key (GUID) based on the computer's hardware to login to our web application.

But how to do that from web (aspx.net, javascript, jquery), can I make some kind of App (or a Winform program), and next time our employees try to login, they have to install the App/application, and then the aspx.net application can call this program and return the GUID to the login service (WCF-service), how to do that?

I have been working with c#, Winforms, Silverlight, aspx.net, javasript, jquery etc. for many years, but this year I have to find out how to developing Apps (cross platform), so if you have an example/link in other than those mentioned language, this would be fine too