Why does the software updating not work

My system refuses to perform a software update. It starts to scan, then only displays a very short blue section on the progress display and then finally quits by refereing to an apparent network problem. However, network checks show that everything is OK.
Any ideas what it couod be or how to overcome the problem?
At the same time, also Safari plays up. When changing websites, in many cases they either don't open or it takes a very long time to start opening. When I disconnect from WLAN and then reconnect, the pages start to load.

Many thanks.
Itunes can not update due to an Invalid signature
That one suggests the installer is getting damaged during the download via Apple Software Update.
Try instead updating your iTunes using an iTunesSetup.exe (or iTunes64Setup.exe) installer file downloaded from the Apple website:
http://www.apple.com/itunes/download/

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