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Look in the BIN folder in your CF install directory. (C:\ColdFusion10\cfusion\bin) There should be a file called passwordreset.bat. It's a batch file. Just run it and follow the prompt to change the admin password.
I had a similar issue this week. It was related to IE. I did an install on the server and the cf admin loaded in IE (which is the default browser). I put in my password and it said "invalid password". I loaded chrome up and it worked fine.
That's probably because Internet Explorer isn't a browser.
Joking aside; I had an instance a while back where I entered a password, CF accepted it, and then when we attempted to access the CF Admin, it told us the password was wrong. We reset it with the batch and tried again only to encounter the same issue.
In the end, we changed our password, because we were using special characters, one of which MIGHT have been a hash mark, and I think that's what threw CF.
As an aside, gotta say I love Chrome. I would say everything Google touches turns Gold, but Chrome seems to be a more valuable element in this case.