I had a power loss, and now Firefox won't start on my XinXP machine. In processes list is firefox.exe, but no window ever opens

I have both Firefox and Thunderbird - both are acting the same. When I double click the exe icon, a process starts, visible in the task manager, but no application ever shows up, in applications, nor any window appaears. Both were working earlier today.

Tried the checkdisk - no help.
I uninstalled ( in safe-mode because the uninstaller would not work either) the printer software, and reinstalled that.
After that, thunderbird and firefox both worked fine. Some part of Windows must have gotten messed up/stuck by the printer software being apparently corrupted. The printer's system tray icon never showed up. Firefox and Thunderbird must have been trying to read printer data at startup, and got hung out to dry...
Thanks for the quick answer

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there is no external backup
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I did a factory reset on my late 2008 MacBook from a Snow Leopard disc. It installed fine, but as soon as I began to use the computer (safari) it froze. Couldn't even force quit. So I held down the power button to turn it off, and now it won't start up.

I did a factory reset on my late 2008 MacBook from a Snow Leopard disc. It installed fine, but as soon as I began to use the computer (safari) it froze. Couldn't even force quit. So I held down the power button to turn it off, and now it won't start up. It goes to the grey Apple screen and just sits there loud as can be. Help! Please keep in mind I've not done anything like this before and am going to need a little hand-holding. Thanks in advance.

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Hey Citrinesky,
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Hello, J Appleseed.
Thank you for visiting Apple Support Communities.
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Thanks Fred, but I've tried '''ALL''' that already.
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Try this from MacFixIt as well:
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Plz help Help I have accidentally deleted the var folder on my mac and now it won't start up what should I do?

Plz help
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Try this from MacFixIt as well:
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I had a power loss, and now Firefox won't start on my XinXP machine. In processes list is firefox.exe, but no window ever opens

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