Unable to access Firefox

I updated to the latest Firefox a couple of days ago & Yahoo also applied an update to their service. However, I did not like the changes but couldn't find a way to return to the way things were so I used a thing called "system restore" to go back a few days but since then my computer just won't work properly. Normally my default browser is Firefox & when I start up yahoo messenger appears & if I click it I can access my email & the web via Firefox. Now when I try to do this or click on any desktop icons an error message appears saying Windows couldn't access it. The only icon that works is Internet Explorer.

Profile is a folder which store all your personal data in a safe place
* https://support.mozilla.com/en-US/kb/Profiles
* here explain how to backup profile https://support.mozilla.com/en-US/kb/Backing%20up%20your%20information
* here explain how to restore it
https://support.mozilla.com/en-US/kb/Recovering%20important%20data%20from%20an%20old%20profile

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