If you get it from steam can you select where it down loads to? My c: drive is full and I have a raptor waiting!
http://www.maximumpc.com/article/howtos/howto_master_your_file_system_mklink
Read this, it works and its the only way
Use the mklink /j command like this
Mklink /J "C:\Program Files (x86)\Steam\steamapps\common\call of duty modern warfare 2" "D:\Games\call of duty modern warfare 2"
remember the " marks and you need to know the location on the C:drive