If you have process having same name, it will be really difficult to collect performance counter. Here is a solution for this by modifying the registry key.
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey:
On the Edit menu, click New, and then click DWORD Value.
Right-click New Value #1, click Rename, and then type ProcessNameFormat to name the new value.
Right-click ProcessNameFormat, and then click Modify.
In the Data value box, type one of the following values, and then click OK:
1: Disables PID data. This value is the default value.
2: Enables PID data.
Exit Registry Editor.