Hi Kim,
What exactly do you mean by the following?
My symantec will not work as my computer will not let me turn it on.
Is there an error message being displayed? Can you let us know exactly what it is?
I recommed running the SymHelp tool with Threat Analysis Scan, and using its Power Eraser capabilities to delete anything clearly malicious that is discovered. If SymHelp will not run for some reason, use the SERT LiveCD.
How to run the Threat Analysis Scan in Symantec Help (SymHelp)
http://www.symantec.com/docs/TECH215519
Please keep this thread up-to-date with your progress!
With thanks and best regards,
Mick