ITunes and Quicktime not running after upgrade

Question

After installing iTunes 5 I get the following error message when launching it:
'The instruction at "0xf4800000" referenced memory at "0xf4800000". The memory could not be "read".'
When trying to run a quicktime clip embedded in a Acrobat document I get the message:
'QuickTime Streaming Extras failed to load because the versions od QuickTime Streaming and QuickTime Streaming Extras do not match.'
If I try to uninstall or reinstall QuickTime I get:
'Error Number: 0x80040707
Description: DLL Function call crashed: QTInstallCode. QuickTimeUnInstallProc..'
The rest of the message is cut off.

Answer 1

well done, Ryan!
"From the command prompt run the following:
msiexec.exe /unregister
msiexec /regserver "
good gracious ... you had to do that to get the Cleanup utility to install?
prior to the new versions of the Windows Installer coming out, i only had to use that trick
b once
to get past an itunes installer error (and i only remember it because it showed up in an almost unique situation where you have to treat the last error in a chain of itune installer errors first) ... but you're about the third or fourth person reporting success with it in the past
b week.
it's a rarer sort of problem, still. but the latest Windows Installer updates just don't seem to have been sticking as well as earlier ones.
many thanks for reporting back!
love, b