system still slow

I ran the CCleaner, rebooted my computer, but my system is still slow. Why is that?

You may have other things going on with your computer such as conflicting software, malware or virus infection.

It is quite difficult for anyone to say when you have given us so little information to go on :)

What operating system do you run?

In what way and when is your sysytem slow?

Has this slowdown happened recently?

Are all you malware/virus scans up to date and clean?

Any other info you can think of?

There are several factors why your computer is still slow.

What hardware do you use??? Maybe your hardware does not is not good enough for your operating system.

There could be a virus that is making it slow.

If there are lots of icons on the side panel, that might indicate that you have several startup programs that run automatically when the computer is turned on. CCleaner can help you disable some of them. Tools>Startup and choose the programs you don't want to run at startup by disabling them.

Maybe your hard disk is fragmented, try doing disk defrag. Use programs like Defraggler for this.

Maybe the inside of your CPU is dusty so better clean that up.