I have been able to play MW3/Warzone fine, up until recently. I own MW2 on Steam and installed it for the campaign, while MW3 I have through Battle.net and had it installed. Considering the two desktop shortcuts are identical, I clicked the MW2 one, and once it launched, I saw it was MW2 (Steam) and closed it. It always takes some time to close, so I opened up MW3 (Battle.net) while the MW2 process was still technically running, and got this error. Now it has this error every time I try to launch MW3 from Battle.net.
I tried checking for updates, scanning and repairing game files, checking the launcher was not running in administrator mode, uninstalling and reinstalling, uninstalling and reinstalling on a completely different disk, deleting MW2 entirely and reinstalling MW3, reinstalling Battle.net, all to no avail. I do not have enough space on my main C drive for the install.
Does anyone have any ideas on how to solve this?