Error installing Node of SQL Server 2008R2 Cluster

For Spanish version visit this link Error instalando Nodo de Cluster SQL Server 2008 R2
This week, we are migrating the Production servers to SQL Server 2008 R2 SP1. During the installation of a Node of SQL Server Cluster, the following error occured:
Error reading from file: X:\PATHFOLDER\x64\setup\sql_engine_core_inst_msi\PFiles\SqlServr\MSSQL.X\MSSQL\Binn\Template\master.mdf
Verify that the file exists and that you can access it.
After doing several tests, we saw that we couldn’t copy files with .mdf, .ndf, .ldf and .bak extensions to C:\ drive, we start to check the users permissions, policies, file permissions and it not worked, so after 3 hours we decided to stop. The next day a co-worker said that could be the antivirus, we disabled it and the installation works like a charm.
This is an example of how an small unexpected failure calculation can make you to pass a hard time. One thing is sure, from now on at the minimum strange error, the first that I will probe is to disable the antivirus.