I receive great computer help thru a newsletter every thursday with a link to ask & search for your problem. It's called "ask the computer lady".
There are also groups here on yahoo that are computer help-just go to groups.
If you are operating a system of windows, go to tools, then go to windows update, in the right top corner of page is a blank search space. Type in a few words relating to your search, and can also use the help link from the windows/microsoft site. Sign up for updates weekly delivered to your email addess & will always be easy to access & they will fix things automatically that aren't operating correctly on your 'puter
Another place to try on your own is control panel, it will let you ask a question for help & give you answers referring to your question.
I had an OS problem last yr, so took my tower to my local 'puter shop. Cost me $59 and they removed & cleaned back as new condition. When doing this option, always take your computer book & any programs you have installed on CD & they will reinstall & have it working fast as lightening. Also don't change things when they do this, they return it to how the system is made to operate.
Good luck, nothing like a frozen or non responsive computer.