Arnak / Tom_More:
Go to Help | About Internet Explorer in IE9 and confirm that your Update Version is at least v9.0.60 (KB4014661), which is the last IE9 cumulative security update delivered by Windows Update during the April 2017 Patch Tuesday updates.
IE9 Version KB4014661 April 2017.png 17.66KB
There is a known issue with Windows Update on Vista SP2 computers where background automatic updates can get stuck on the the initial "Checking for updates..." phase without throwing an error message. If this happens the Windows Update Agent (running under the Windows host process svchost.exe) will saturate an entire core of your CPU and consume significant amounts of RAM for hours (or even days) and can severely impact your system performance. There is no associated disk read/write activity or extra bandwidth consumed on your internet connection but you might notice your cooling fan running frequently if it needs to cool your CPU.
If you think your system might be affected see the step-by-step instructions on page 1 of m#l's thread Updates not working, it has been searching for updates for hours in the MS Answers forum.
Even if you manage to patch Vista SP2 as of 11-Apr-2017 (i.e., the end of extended support for this OS) the "Checking for updates..." hangs and high CPU consumption will return every Patch Tuesday on the second Tuesday of the month if you have MS Office 2007, MS Office 2010 or the MS Office Compatibility Pack SP3 installed. A workaround for that problem is also discussed in m#l's thread.
32-bit Vista Home Premium SP2 * Firefox ESR v52.2.1 * NS Premium v188.8.131.52 * MS Office 2003 Professional SP3
Edited by lmacri, 07 August 2017 - 08:58 AM.