When trying to install OSX on my 2011 macbook pro I received the error message"Install Failed Mac OS X could not be installed on your computer The installer could not copy the necessary support files click restart to restart your computer and try again."

OS X comes in many versions. What version are you currently running and what version are you trying to upgrade to?

How much space is left on the hard drive?

You should be able to install Mac OS X 10.7 or later on your 2011 MacBook Pro without issue, if it came with 10.6.3 as your signature suggests. Mind you, any 2011 MacBook Pro must use the original 10.6 installer disc labelled MacBook Pro if it desires to have 10.6 installed on it. The retail installer disc will not work on that model, nor will one from another age MacBook Pro, or other model labelled installer. Also

10.7 came both on USB Flash drive and Mac App Store installer versions. Both required either 10.6.6 minimum be pre-installed, or no Mac OS X operating system on the drive or partition it was to be installed on.

10.7.1 through 10.7.5 combo could be installed only once 10.7 had been installed. A combo update is available for installing on top of any version of 10.7. Otherwise only the preceding version could be updated to the next.

10.8 came only on Mac App Store installer. It is available only to 10.6.8 and later users.

10.8.1 to 10.8.5 combo could be installed only once 10.8 had been installed. A combo update is available for installing on top of any version of 10.8. Otherwise only the preceding version could be updated to the next.

10.9 came only on Mac App Store installer. It is available only to 10.6.8 and later users.

Both 10.9 and 10.9.1 had a serious security vulnerability, which only 10.9.2 addressed.

10.9.2 combo could be installed only once 10.9 had been installed.

For all three Mac App Store releases, the partition to be installed on had to be GUID partition formatted according to Apple Disk Utility.