For the second time I spent over an hour looking for my player profile folder. I finally found this in another forum::
All Windows Operating Systems:
What you need to do is copy your mpdata file in order to back up your profile but the location changes depending on what OS your running so...
Windows XP:
CProgram Files\Activision\players\profiles\(your profile name)
Windows Vista x86:
With UAC Disabled:
CProgram Files\Activision\players\profiles\(your profile name)
With UAC Enabled:
CUsers\(your username)\AppData\Local\VirtualStore\Program Files\Activision\Call of Duty 4 - Modern Warfare\players\profiles
Windows Vista x64:
With UAC Disabled:
CProgram Files (x86)\Activision\players\profiles\(your profile name)
With UAC Enabled:
CUsers\(your username)\AppData\Local\VirtualStore\Program Files\Activision\Call of Duty 4 - Modern Warfare\players\profiles
Then make sure your mpdata file is on like a jump drive or an external HDD this way if you ever need to reinstall you'll still have it. Then if
you ever need to restore it just copy it back into whatever folder you got it out of. Hope this helps some people out.
SOURCE
http://forums.fubar-online-gaming.com/index.php?showtopic=4287
All Windows Operating Systems:
What you need to do is copy your mpdata file in order to back up your profile but the location changes depending on what OS your running so...
Windows XP:
CProgram Files\Activision\players\profiles\(your profile name)
Windows Vista x86:
With UAC Disabled:
CProgram Files\Activision\players\profiles\(your profile name)
With UAC Enabled:
CUsers\(your username)\AppData\Local\VirtualStore\Program Files\Activision\Call of Duty 4 - Modern Warfare\players\profiles
Windows Vista x64:
With UAC Disabled:
CProgram Files (x86)\Activision\players\profiles\(your profile name)
With UAC Enabled:
CUsers\(your username)\AppData\Local\VirtualStore\Program Files\Activision\Call of Duty 4 - Modern Warfare\players\profiles
Then make sure your mpdata file is on like a jump drive or an external HDD this way if you ever need to reinstall you'll still have it. Then if
you ever need to restore it just copy it back into whatever folder you got it out of. Hope this helps some people out.
SOURCE
http://forums.fubar-online-gaming.com/index.php?showtopic=4287