Windows 7 still uses the 32 bit version of 'Windows Media Player' even though you run a x64 build of Windows 7, there is however a way to change this and there are som advantages by doing so, among others you will be able to use your 64 bit video codecs instead of 32 bit, so you will be able to use your 64 processor. Follow the tutorial by clicking read more.
This is how you do!
Open a command prompt as administrator.
Write "unregmp2.exe /SwapTo:64" without the quotes and make sure to write capital letters in capital, this command is case sensitive!
Open the Windows 7 registry (Windows button + r, write regedit and enter)
Go to HKLM\Software\Microsoft\Windows\CurrentVersion\App Paths\wmplayer.exe\
Double click the "Path" value.
Change the value “%ProgramFiles(x86)” to “%ProgramFiles%”
Close the Windows 7 registry and you are done.
This is how you do!
Open a command prompt as administrator.
Write "unregmp2.exe /SwapTo:64" without the quotes and make sure to write capital letters in capital, this command is case sensitive!
Open the Windows 7 registry (Windows button + r, write regedit and enter)
Go to HKLM\Software\Microsoft\Windows\CurrentVersion\App Paths\wmplayer.exe\
Double click the "Path" value.
Change the value “%ProgramFiles(x86)” to “%ProgramFiles%”
Close the Windows 7 registry and you are done.