computer is crashing when i go online

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Hi I hope somebody can help please.
I got a peer to peer program on my computer recently called 360 share.
It made my comp go crazy.
Whenever I start up the computer, the computer would basically crash
and I get a message from norton virus protector program saying
uninstall. I uninstalled 360share and norton and this seems to have
helped a little.
But when I click on the internet the computer crashes again.
I have noticed that when I go to task manager and go to processes the
seems to be a lot of programs running on start up.
I have also noticed that when I click on one of the processes -
IEexplorer.exe and choose end program, everything goes back to normal
and unfreezes. I basically cant go online or access my files and this
happens everytime I turn on the computer. I am about to get my computer
completely wiped clean. is there anything I can do before I take such
an extreme measure?
help greatly appreciated.
Lisa.

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