A (longish) time ago, back before 1.10, I could see the coordinates, block ID, and biome from my Minecraft's F3 debug screen.
And then the malware came. I ended up reverting to a backup three times to delete it. (Sometime after that fiasco, I tried getting on a heavily modded server, the downloading of the proper mods and Forge seemingly being the cause of the second problem).
My problem is now twofold. The only way I can open Minecraft is through the launcher.jar file (Minecraft.exe, Feed the Beast, and TechnicLauncher do not open anything. Ever since I went on that server that one time, I am now no longer able to see my coordinates or the block I'm looking at.
How do I fix this? Should I uninstall? (How do I uninstall? I'd need to remove every file related to Minecraft from my computer).
I would love to know what block I'm standing on again, and what block I'm mining. After all, surprise Silverfish are a horrible fate...