HELP

I downloaded somemething from one of stumpys help pages and my keyboard andacursor are working all wierd! My keyboard randomly types "adadadadadaadadadad" and my cursor moves ertaticly everywhere and clicks by itself! is it a virus???/ please help its getting annoying.. and it clicks and randomly pushes my webpages backwords...please help me...im
on a wooden desk with curtains closed..

man i have to question you,please answer.
1.-¿what page you download that file or whatelse?
2.-¿Your antivirus detected something like troyans or viruses?
3.-¿can you type something in internet explorer or in a document?
the possibles answer are.
you got a virus or a troyan
you got infected and when you get this problem for a long time you can not repair it.
¿solution?!
you have to reinstall your computer or your OS.
Please answer.

now this is just exaggerating

"on a wooden desk with curtains closed.."