What OS are you running? Here is some general things you can do to help a slow computer. Please provide a little bit more detail about a problem and your computer specs.
First thing to do is run a Virus Scan.
Here is an online scan which works pretty well. You can also look up free-av (free antivirius) and install it on your computer.
Then run a spyware removal tool. I like
Spybot Search and Destroy
If you can use a registry cleaner (I use registry mechanic), but i don't know of any free registry cleaners, sorry :( *this one isn't as big of a deal as the others.
Then clear temp folders, and clear out any internet browser information (cookies, offline files, ect).
Check to see if you have a decent amount of hard drive space left (if you fill up your entire hardrive your pc will run a lot slower than normal). Then check to see if you need to defrag your hardrive. (right click on the drive letter in my computer->properties->disk tools->defragment. Click the analyze button to see if you need to defragment your harddrive).
The items listed above is just general maintenance for your pc. I try to do this once a month (usually only happens once every three months).
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