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"Failed to load driver" when I start profiling

I installed CodeXL 1.3 on windows last week & when i pressed Start button (to start CPU time based sampling), it gave an error dialog box saying "Failed to load driver. The previous driver version was still loaded, please reboot". If this means to reboot the PC, i did & got the same error message.

What does this message mean ? & any suggestions ? FYI  i have CodeAnalyst installed too & it works fine



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