I am using Windows 7 laptop. I need to uninstall Adobe Reader X 10.1.9 update. The uninstall option doesn’t appear on installed updates screen for Adobe Reader. For other software it works correctly. Sorry for my poor English.
P.S: 10.1.9 update gave me killav Trojan.

1. Adobe Flash Player

1. Starting with your last sentence, this suggests that you downloaded a fake update, as a real Adobe product wouldn't infect your computer. This also explains why you can't remove this 'update'.

   Get rid of the virus and give your computer a good clean (see my response to the 'win32:killav.DR Trojan' question). I'm not sure it's necessary, but you could also remove Adobe Reader altogether with Revo uninstaller or ioBitUninstall, which will remove many of the traces left behind by the ordinary uninstaller. You could then download and install the latest version of Adobe Reader or a alternative to it (I prefer Foxit Reader, while other people swear by PDF-XChange Viewer).

2. maybe this tool can help fixing
   Adobe Reader and Acrobat Cleaner Tool
   http://labs.adobe.com/downloads/acrobatcleaner.html

   or you can download Adobe Reader X 10.1.9 and click on the exe perhaps you will get repair option

3. First and foremost, I really doubt that an Adobe Reader update installed a trojan on your system. Since 10.1.9 was released on Jan 14, I have installed it on about a dozen machines with absolutely no ill effects although I did the install from within Adobe Reader itself (Help - Check for Updates...). I also did 2 updates on non-Internet connected machines using the standalone updater from the Adobe site. If you downloaded it from another source, that is another matter.

   Second, uninstalling the update (if it was possible) will not get rid of the trojan. You will need to run a virus scan using your installed AV software (possibly in Safe Mode) or Malwarebytes or another antimalware package to get rid of the trojan.

   Third, I don't remember any version of Adobe Reader being able to uninstall any particular update that has been applied to it. Your only option under Win7 would be to go to Control Panel - Programs and Features - Unistall software, selecting Adobe Reader and uninstalling the complete package. You will then need to download the latest version you wish to use (X or XI) and install that (or another PDF reader if you want to avoid the frequent updates from Adobe).

Adobe Flash Player

The last version of Adobe Flash Player 21.0.0.242 is available through Windows Update, try to download and install the update KB3163207, we will update to the last version of Adobe Flash Player 21.0.0.242. Windows 10 received a couple of updates as part of this month's Patch Tuesday rollout, so insiders running build 9926 of the technical preview are strongly recommended to deploy both of them as.