Unable to create a snapshot replication

Hello,

I was able to create distribution, publisher for snapshot replication, but not the subscription and I'm getting the following warning.

Subscription for the following subscribers cannot be initialized immediately because the snapshot is not available: 

Below is the error for the same from replication Monitor

'C:\Program Files\Microsoft SQL Server\MSSQL10_50.SQLSERVER2008\MSSQL\ReplData\unc\A$SQLSERVER2008_TESTREPLICATION_SNAPSHOT_PUBLICATION\20130330150033\' is denied.

I tried giving full access to the user A but I was unable to do that(error is Process cannot access the file because  it is used by other Process)

Can someone help me in fixing the issue.

Thanks,