Hi, We are getting first chance exceptions, if our API call (RegQueryValueEx) contains global query for performance counter data. Below is the stack trace. 0018def0 7553374b 000006ba 00000001 00000000 KERNELBASE!RaiseException+0x58 0018df0c 75535819 000006ba 00000001 0018e33c rpcrt4!RpcpRaiseException+0x7b 0018df1c 755c011d 0018df6c 00000004 0089ef98 rpcrt4!NdrGetBuffer+0x47 0018e33c 70ce3127 70ce1cc8 70ce1b42 0018e35c rpcrt4!NdrClientCall2+0x17a 0018e354 70ce2677 00000000 0018e418 e0e161f9 browcli!I_BrowserrQueryStatistics+0x19 0018e39c 70d0278d 00000000 0018e418 0018e594 browcli!I_BrowserQueryStatistics+0x26 0018e420 70d014fd 0018e57c 0018e448 0018e440 perfnet!CollectBrowserObjectData+0x7a 0018e450 75779e01 00010120 0018e57c 0018e5ac perfnet!CollectNetSvcsObjectData+0xc6 0018e468 7577a2e6 008bee00 75777de0 0018e57c advapi32!CallExtObj+0x17 0018e5c8 757780ae 0018e614 e2e116fc 0018ead0 advapi32!QueryExtensibleData+0x735 0018e9ac 752c71c4 80000004 0018ead0 00000000 advapi32!PerfRegQueryValue+0x5da 0018eaa0 752a2230 80000004 0018ead0 0018eae8 kernel32!LocalBaseRegQueryValue+0x366 *** ERROR: Symbol file could not be found. Defaulted to export symbols for psx_perf.dll - 0018eb0c 6500209c 80000004 65015d84 00000000 kernel32!RegQueryValueExW+0xb7 Anybody has come across this problem before? We found one similar issue which has addressed on Windows 2008 Server, http://support.microsoft.com/kb/953290 But it seems this has fixed in Windows 2008 R2, because it is not applicable for it. Any suggestion will be highly apprciated. Thanks, VIJ VJ