When clicking on links in program i.e online help or get updates now CCleaner sites open in both IE7 and Firefox. Firefox set as default browser. Using Windows XP service pack 2 with all updates. Firefox 2.0.0.3, CCleaner 1.39. Reinstall of CCleaner had no effect. Thanks in advance.

Its your default browser set up thats screwy. Try this:
Open Internet Explorer and set it to the default browser. Then close IE and set firefox as default again. Let me know what happens.

Thanks rridgely for the quick reply. Tried your suggestion, set IE7 as default browser, closed and reset Firefox as default. No change both still open when clicking link.

Wow, thats odd.
Try setting IE to default and then click the link. Does only IE open?

With IE7 set to default. Only IE7 opens

So it has to be something up with setting firefox with default.
The only problem is that I don't know whats wrong.

You have all of the available windows updates right? Make sure that you do and if not see if that fixes it.
If not then try the below.

Go to start run and enter:
firefox.exe -silent -nosplash -setDefaultBrowser

Let me know if only firefox opens.

Had all updates so I tried your second suggestion. Links now only open in Firefox. Hooray! Thanks for the suggestion.

Awesome, thanks for posting back. Nice to know it worked just in case anyone else has this problem.

Then things got really weird. Your suggestion worked, but only once. Every time after IE7 and Firefox both opened. Based on your suggestion to include "-nosplash" in the run command, I disabled a Firefox extension which added a splash screen to Firefox. Bingo! CCleaner links open in Firefox 100% of the time now. Strange but true. Thanks again rridgely

Weird, what is the name of the extension? (for future reference. )

Splash 1.2.2

I have that and it causes no problems, strange. Might be worth letting the extensions developer know about this in case its a bug.

Done. Thanks to all.

In researching another problem, found that this was not problem with Splash or CCleaner but known bug in Firefox. http://kb.mozillazine.org/Windows_error_op..._file_-_Firefox fixed the problem. Kudos to rridgely who recognized it as Firefox default browser problem.