Just tried corflags and it worked. This is a console application, so you should use it from command line or PowerShell.
1) Place corflags.exe (if you've downloaded it) to directory where NexusClient.exe is
2) Press windows button, then type in "cmd" (no quotes)
3) Open cmd application (i've opened it "as admin" by right clicking on the cmd app shortcut in search results)
4) In cmd type cd C:\Program Files\Nexus Mod Manager (you should change this path so it points to directory from step 1)
Press enter
5) Then again, type CorFlags NexusClient.exe /32Bit+ (press enter)
Here, I made this screenshot:
http://i.imgur.com/YIjn33w.png
(sorry for russian interface and putin in the screenshot. I really should delete that news app)
