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Mozilla Firefox does not start up.....

Today I wasted many hours tackling with Mozilla Firefox which for unknown reasons had decided not to start. It began when I installed 3.01 version of it. Every time I started it up, the following annoying message was displayed,
"Could not initialize the browser's security component. The most likely cause is problems with files in your browser's profile directory. Please check that this directory has no read/write restrictions and your hard disk is not full or close to full. It is recommended that you exit the browser and fix the problem. If you continue to use this browser session, you might see incorrect browser behavior when accessing security features."
And then like a very humble person apologizes me," We are very sorry." A few days ago I had my PC infected by some latest, modified, out-of-database of my dear Kaspersky, virus-may be a trojan, worm or whatever. I had wasted a lot of time there to cop up with that. And now this, my dear Mozilla suddenly went crazy.

Well to rectify the problem the one and only method that I have is search on google. I always know that I am not the only person with that problem, there must be someone else too. With no surprise I got the solution. There I came to know about four possibilities behind that problem:

1. Low Disk Space - less than 1 MB
But, I had plenty of that, about 10GB.

2. File permission in your profile folder of Mozilla. The cert8.db must not be read only.
They told me that the profile folder path is C:\WINDOWS\Application Data\Mozilla \Firefox\Profiles\xxxxxxxx.default\ , but it was not. Actually it is C:\Documents and Settings\\Application Data\Mozilla\Firefox\Profiles\xxxxxxxx.default.
So I checked for cert8.db. It was not there at all!!!

3. Corrupted file cert8.db. It was instructed to delete it and restart the firefox. since I had no file by this name at all, it was useless.

4. New Profile :Your settings may have become corrupted due to changes in your system or a lack of hard drive space at one point. Create a new profile with the Profile Manager.
I did the same but still no luck. The problem was still there.

I installed and uninstalled different versions of mozilla again and again in idiotically different ways.
Finally I got rid of this problem in some another way. I deleted the default profile and created a new one in the directory C:\WINDOWS\Application Data\Mozilla\Firefox\Profiles\. Voila firefox was healthy once again. Till now its running fine. Though I still don't know who was the devil behind the scene. Why changing the directory solved the problem? Is there some virus still playing around? Well, somehow it solved my problem.