Acer aspire one zge netbook wont update windows

The other expert's answer here applies if the problem is a failure of scheduled automatic updates to initiate updates downloads.
along the same lines of scheduling issues automatic updates can also fail to download and install if your netbook is either never in use or not online during the automatic updates default settings time window - if so reset the scheduling of automatic updates to a time when the netbook is more likely to be both in use and online.
if the problem is not just the scheduling of automatic updates but that certain or all updates will not download or install whether automatically or manually then the problem may either be a firewall or download corruption problem.
in the security center in control panel if no exceptions are currently allowed change the settings of the firewall exceptions to allow automatic windows updates and other permitted updates such as antivirus antispyware and essential non-Windows/non-Microsoft utilities such as java and flash player.
if this does not solve the problem then go to automatic updates in security center and delete any updates downloaded and installed since the problem first occurred then run Disk Cleanup - start -> all programs -> accessories -> system tools - to delete temporary internet and downloaded program files. when disk clean up is complete (the disk clean up box disappears on completion) restart the netbook. then set automatic updates to start in 5 minutes time and allow the download and installation process to complete then shut down the computer to allow the updates to fully configure. then restart the computer and check automatic updates download history in security center to make sure all the updates were successfully downloaded and installed.
it is better not to manually download and install windows updates as this can potentially lead to certain updates being installed out of sequence which can be a potential cause of update download corruption. automatic updates works very well and can run in the background while the computer does other things, so the automatic method is usually the best way to go

hopefully between all the answers on this page you will have enough information to help you solve your problem.

Check the TIME and DATE settings, Set Correctly, then you will be able to Update...