Can anyone help me? When I excecute MW3 this error appears: WIN_DISK_FULL_TITLE: "Modern Warefare 3 can´t write an archive. It looks like your HDD is full." but my HDD it has 350 free GB!! i don´t now what to do, please help me please!!....Thanks in advance!!!.
I would suggest you run a full anti virus scan, and download Spybot Search & Destroy as well as Malwarebytes, and run a full system scan.
If it won't let you run them in normal Window's mode, then you will have to run them in Safe Mode with no internet connection.
The reason I say that is because there is a virus and some spyware out there that will stop you writing to you C: drive or stop programs writing to it, even though it will appear as though it has plenty of space free, also you need to check that the drive has not been made Read Only.