Downloading?

Hello i have a problem i a tryining to install Itunes/quicktime etc. and every time i do it says "another installation is in progress. complete this one before continuing this one." this happens for ever programme/app i try to install

ps i am also not installing anything (i checked)

perhaps an app to cancel all downloads?

any help would be much appreciated

Try downloading the installers manually, saving them to your downloads folder or desktop, disconnect from the internet, reboot and re-run the installers.