This is from an other post. I did not kept the source.
Try this fix. Just in case you want it back on occasions.
I made two shortcuts in my Links area under Internet Explorer, which
each run a command:
Flash On:
"C:\WINNT\SYSTEM32\regsvr32.exe"
"C:\WinNT\System32\Macromed\Flash\swflash.ocx"
Flash Off:
"C:\WINNT\SYSTEM32\regsvr32.exe"
"C:\WinNT\System32\Macromed\Flash\swflash.ocx" /u
(these are word wrapped for usenet, you must combine the two lines
back together, separated by a space)
Of course, if you're not running an NT-kernel OS, or if you installed
flash in a different directory you'll have to adjust the paths to
regsvr32.exe and swflash.ocx