heya Powderfactor and welcome to BC
Please take time to visit our New User Orientation Centre
which will familarise you with the site.
Feel free to look at the tutorials
which have a lot of useful info.
Try searching for fixes if you know what your problem is (ie your exact trojan/virus infection or computer problem).
If nothing is found, post your problem in the appropriate forum by starting a new thread. Add as much information about the problem as you can. Please be patient for a response, as there may only be a limited number of helpers available.
I'm sure someone will be able to help you