If you have a dedicated Windows server from 1and1 yes, you can login to the dedicated server using remote desktop and you should be able to use the Platform Installer to install mojoPortal.
I only recommend 1and1 for dedicated servers, I do NOT recommend them for shared hosting, as far as I know their shared hosting does not work with mojoPortal, though I have not looked at it lately, the last reports I had from others who had tried it, it did not work at all. But maybe it can work now if they are offering .NET 3.5 hosting. The problem was before they offered 2.0 .NET but did not have ms ajax installed. This was quite a while back when mojoPortal ran on 2.0 .NET, but recent versions of mojoPortal require .NET 3.5, and the ajax stuff is baked into 3.5 so it is not a separate install, as it was in the 2.0 days.
They are absolutely the best deal I know of for dedicated servers though.
Hope it helps,