Further to JonhC_21's comment, I've also posted a FAQ in the VistaForums at How to Fix Vista SP2 "Checking for Updates..." Hangs and Slow Windows Updates that includes an overview of the problem. As noted in that FAQ "Users who perform a clean re-install of their Vista OS will encounter these 'Checking for updates...' hangs as soon as Service Pack 2 (SP2) is applied."
If you've applied SP1 (released 04-Feb-2008) and SP2 (released 25-May-2009) then you might still have IE 7 or IE8, since IE9 was not released until 14-Mar-2011. If Windows Update has somehow managed to upgrade you to IE9 since SP2 was applied, open iE9 and go to Help | About Internet Explorer and let me know if you have Update Versions 9.0.60 (KB4014661) as shown below. KB4014661 (Cumulative Security Update for Internet Explorer 9: April 11, 2017) is the last IE9 update delivered by Windows Update before extended support for Vista SP2 in ended on 11-Apr-2017, and if your IE9 browser has a lower Update Version (KB number) that should give us an idea of the last time Windows Update ran to completion on your system.
IE9 Version KB4014661 April 2017.png 17.66KB
Also note that Google ended support for Chrome on the Win XP and Vista SP2 platforms in April 2016. See my comments in pcpunks' thread Most Popular Browser For Vista.
32-bit Vista Home Premium SP2 * Firefox ESR v52.9.0 * Norton Security Premium v126.96.36.199 * MS Office Professional 2003
HP Pavilion dv6835ca, Intel Core2Duo T5550@1.83 GHz, 3 GB RAM, NVIDIA GeForce 8400M GS
Edited by lmacri, 07 November 2018 - 01:08 PM.