if you think the live update cause this, do sytem restore(
read here how to do this) and select the date before the live update.
another thing is the downloaded file is corrupt and try to download again. i suggest you download the offline installer.
here: US English:
ymsgr900_922_us.exelast one it might come from virus, try bitdefender of mcafee and scan, even it is trial it would remove the virus.
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