I wouldn't give Linode up just for that. Setting up a .NET service that also uses a MSSQL database, in Linux, would be an overkill, compared to moving an already setup Windows VM, i think. That's why i'm trying to find a way to do that. I don't care about performance at all, i just want to have that service available for history purposes.

So, any ideas as to how i could run Windows inside a linode?

You say you don't care about performance, but do you also not care about reliability? Because even if you manage to get some hacked up monstrosity running Windows inside of a Linode, it's going to be unreliable as all get out.