error "Class not registered"

[tispe]

When going to line in the result window and wanting to enter a presented folder I suddenly can not Enter/Left click on a the folder anylonger.
Just get the error everything search engine error "Class not registered".
Error log says:

• 2011-06-19 00:33:19: Everything 1.2.1.371: d:\dev\everything\src\mu.h(1094): mu::ShellExecuteExUTF8_idlist(): ShellExecuteExW(): GetLastError(): -2147221164: failed to execute
  2011-06-19 00:33:59: Everything 1.2.1.371: d:\dev\everything\src\mu.h(1094): mu::ShellExecuteExUTF8_idlist(): ShellExecuteExW(): GetLastError(): -2147221164: failed to execute
  2011-06-19 00:37:44: Everything 1.2.1.371: d:\dev\everything\src\mu.h(1094): mu::ShellExecuteExUTF8_idlist(): ShellExecuteExW(): GetLastError(): -2147221164: failed to execute
  2011-06-19 00:41:24: Everything 1.2.1.371: d:\dev\everything\src\mu.h(1094): mu::ShellExecuteExUTF8_idlist(): ShellExecuteExW(): GetLastError(): -2147221164: failed to execute

Right click and open works thoug.?
Any suggestions that could help me out - highly appreciated.
Sven svensson

[void]

Does the error occur in Windows Explorer with the same files/folders?

Error -2147221164 is Error 0x80040154 retreiving COM Class factory.
There may be an unregistered or missing system dll, or something wrong with the registry?

Another way to debug this problem is to use the RegMon utility, available for free at http://www.sysinternals.com. It shows you how your app uses the registry.