When Enhanced Windows Backup starts up it tries to see if it is already running. Multiple concurrent copies are not supported. To achieve this it loops through reading the name of all existing processes. If for some reason, the process performance counter is disabled, then this can cause the program to fail with a fatal error.

You may get an exception Thrown as follows :-

Possible Causes

1. It would seem that on quite a few systems, certain performance counters have become corrupted by one of the automatic windows updates. To fix the problem you need to rebuild the performance counter files as described in the following microsoft article.

http://support.microsoft.com/default.aspx?kbid=300956

2. It is possible that registry keys have been setup that disable performance counters

Start Regedit.exe. (You cannot use Regedt32.exe because it does not allow searching for registry values.)
Open the following key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services

Select Find from the Edit menu.
In the Find What field, type Disable Performance Counters.
Click Find Next. This will locate a Performance key that may have this Registry value set to 1.
If the Registry value is set to 1, set the value to 0 or delete the Registry value.
Press F3 to find the next occurrence of this Registry value.
Repeat the previous two steps until there are no Performance keys that have the Disable Performance Counters value set to 1.
NOTE: If you do not find the "Disable Performance Counters" key, this indicates that your performance counters are enabled correctly.

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