I need help....

my computer is very slow now. before it was not that slow. i think it began right after i used my internet and restarted my pc many times.
i went to the task manager, and the cpu usage doesn't go down 100%. it stays at 100% even i am not using any applications. and when i open something, like Microsoft word for example, it takes almost a minute to open it. i know theres a problem with my computer. i just don't know what to do. my friend told me me to reformat but i have lots of important files in it. what should i do?
i hope there's someone out there who could help me.

thanks...I need help....

 

 

 

 

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