Solution for this problem is differnt with 64bit and 32bit systems, for vista atleast, you have to install and register from the sysWOW64 directory in windows.
For 64bit versions of windows:
1.Copy and paste the MSCOMCTL.OCX file into C:\Windows\SysWOW64(default directory)
(the reason for this is cause this is a 32bit file, if it was a 64bit file it would go into the system32 directory and there would be no problem)
2. Browse to your command prompt via Start-->Accessories-->Command Prompt. Right click on that and run as administrator.
3.A Black window will open type "cd.."(WITHOUT QUOTES!) then press enter, do this 2 times until you get c:\> like shown below(the c drive is ususally where windows is installed, if its not there, look around and once you find the drive its on type "driveletter": So if your drive was D you would type "d:" without the quotes.

4.In that same black box type "cd windows" (or where ever your windows directory is located) Then "cd syswow64" and then type "regsvr32 mscomctl.ocx". If you are successful you will get a little box saying "DllRegisterServer in mscomctl.ocx succeeded."

5.Then just press ok, FLAC frontend should now work on your 64bit system


note: For the 32bit system its pretty much the same, do everything normally but change the directory where you put the .ocx file and the "regsvr32 mscomctl.ocx" command to c:/windows/system32.