My computer was used only one year, but it runs very slow. When I open several windows at the same time, it could not work, which makes me crazy. What can I do now?
Go to accesoires>System Tools>Disk Cleanup. Don't be afraid, it doesn't erase your files and your PC will speed up.
What's also usefull is going to 'run' and type %temp% then you delete all the files that will appear since those are 'broken files'.
Yea, emptying temp is a good idea, as well as Disk Cleanup.
Buying more RAM is a fast way to speed up your PC but ultimately, it can be very expensive. Virus scans and uninstall unneeded programs are also good ideas.
You can use Krojam Cleaner. Krojam Cleaner certainly provides a powerful tool and interface for cleaning your junk files and restoring your computer to top performance.