Click the "Start" button then click "All Programs" then right click the "Startup" folder and select open.

There is a firefox shortcut in there, select it, and delete it.

exit firefox and restart the computer.

thank you

Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

Thank you for your response. I followed your instructions and there are no items in the "Starup" folder, so I still have the same issue...

Try to disable it from msconfig.

read here how to find(if you did not known) system configuration (typing msconfig in search box):

http://netsquirrel.com/msconfig/msconfig_vista.html

follow the instructions to go to startup tab,

then in startup tab unckeck firefox then click OK to save changes then click restart.

thanks again

Thank you for your reply. That was the first thing I tried, but there is no firefox program in this startup menu..... still having the problem and cannot find where it is located to "uncheck"it...

Look here How to Remove , Enable , or Disable a Startup Program With Windows Defender or(better but be careful)With the Registry Editor :

http://www.vistax64.com/tutorials/79612-startup-programs-enable-disable.html

thanks again