In the launcher, when I try to start iw5 somehow, the game does not want to boot up (note that it did in fact boot up last time!)
And so, when I try to boot up pluto t6 in the launcher, that too didn't want to boot, so when I went into the t6 directory and launch t6rmp.exe, it booted up just fine.
I think the launcher has broke for me....
I have the same issue as well.. And now IW5 isn't launching at all.
You need to exclude the folders Plutonium uses from your AntiVirus.
Download that (it might warn you it's malicious, ignore the warning, this file adds the exclusions, you can open the file in notepad to double check the commands).
Run the file as administrator (or it won't work) and then restart plutonium.exe