windows vista error message "couldn't load main class"

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I ran windows update yesterday and installed the advised updates, on restarting my laptop today the error message "couldn't load main class" appeared in a box and I couldnt do anything until I had closed this box, after that on loading firefox it displayed

a not responding message, then a bar opened stating that adobe plug-in didnt start properly so I clicked to re-load page, I then restarted my laptop to see if this had resolved the issue but the same error message appeared and firefox responded in the same

way, has anyone any idea how I can resolve this issue?  I run comodo anti-virus and malware software and my OS is windows vista 32. I also downloaded an update for adobe flash yesterday but the problem didnt occur until after I had done the windows updates. 

Thank you 

 

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