Right click (if you can) on the desktop and do new shortcut, and it is worth trying taskman.exe, but if you can't, type this - "shutdown -i" and you can set options from there.
If that fails, you can close your remote desktop session, and then reopen remote desktop connection, but do not click connect. Click options then programs and click "start the following program on connection" and it is worth trying to launch task manager or cmd through that method.
Lastly, you can try connecting through remote desktop via start > run (on your machine) then
mstsc /v: /admin (on newer)
mstsc /v: /console (on older)
and you should be connected to the console session which may be able to launch files if a virus stops you under another user (I know this sounds stupid, but sometimes I have found it to work).