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Thank you so much, mchain. Since my other topic was about the connection error and it’s now fixed by using a proxy, I prefer to use this one so that if someone else encounters the same problem (which I believe there are others with the same problem), find this topic easier by searching the web.
Although I’ve already installed all MS runtime libraries (such as VC++ redist packs, MSXML updates and .NET frameworks) and updated them all by Windows Update, I downloaded and installed the file you’ve mentioned but WU didn’t find any new update even after restart. 9.0.30729.6161 is in the Programs and Features list as you can see in the following screenshot:
http://i42.tinypic.com/skylj8.jpg
Speaking of automatic VPS updates, I always shut my laptop down every night. So I presume I have to get the auto-update check every morning…
P.S. Either I’m lucky or Avast has improved the free version as I can change the interval too. But as I said before, it seems that VPS check interval will be interrupted when the system goes to sleep. (I changed it to 60 as you suggested)