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Upgrade of Firefox 7.0.1 to 8.0 is rejected with the following info: Earlier upgrade has to be completed with a newstart. However newstart does not help.Deinstallation of Firefox 7.0.1 via Windows 7 not possible.not possibleso

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Windows 7 Firefox 7.0.1 Printing PDF was not possible ==> tried new installation of Firefox 7.0.1. New installation was not successful. Tried again. Instatallation was rejected with the info: "earlier upgrade has to be completed with a newstart". Initiated newstart, however nothing happens. Retry shows same. Installation of Firefox 8.0 showed same results.

Windows 7 Firefox 7.0.1 Printing PDF was not possible ==> tried new installation of Firefox 7.0.1. New installation was not successful. Tried again. Instatallation was rejected with the info: "earlier upgrade has to be completed with a newstart". Initiated newstart, however nothing happens. Retry shows same. Installation of Firefox 8.0 showed same results.

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I installed 8.0 and can't get to the web. How do I get 7.0.1 back?\