Norton and rundll.exe

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I recentlyadded norton internet security 2009 to my main desk top computer,
it said I needed to remove other versions which it did the restarted, only to
find all the icons had changed, now I cannot open anything as a message about
file type rundll.exe not found also I get an error message at times saying
not a win32 application. I have run norton for about 5 years regulary getting
updates scans etc, so i think its not a virus but its just mucked up all my
files, anyone with anyideas or help, thanks diablonf

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