SOURCE: when i try to install a critical update it was
Install Winrar, Here is the link
http://www.rarlab.com/rar/wrar391.exe
if you double click the file,the files will be extracted in the temp folder,so after installing winrar,right click on the file and select extract here. and try to install the update now,
Sometime when you extract files and it contains Malware or Trojan,Anti-Virus which support real time scan just block the files and the access denied message is displayed.
Scan the extracted files before installing so that you know it's Virus free.
Sometimes,even if you have administrator right,sometimes due to malware infection, you are denied access to some system hidden giles like folder under Local settings.
SOURCE: How to get into my Blu Touchbook tablet if I forgot my password
Follow these steps: https://www.youtube.com/watch?v=qEHbLLF7MrI
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