Vista - Cannot download any updates

theres something wrong i can't make it work it out - my internet is connected to the internet but it does not download any updates and says that it could not download anything and therefore i have to do a fresh install, i recently had an error when i tried to start my vista gave me error of that winload.exe was missing or corrupted - i have seen that its not missing so there fore it is corupted - is there any way to fix this?

You have to check diagnose on presence any viruses -because scanning by using installed protected software is not credible -many viruses can hide before these program the better way use external tool - I recommend Malwarebytes.org
if nothing wrong find follow to below steps:

Run cmd.exe with administrative previlliges and type

sfc /scannow

when it will done create report

Run cmd.exe with administrative previlliges and type

findstr /c:"[SR]" %windir%\logs\cbs\cbs.log >%userprofile%\Desktop\sfcdetails.txt

on your desktop appear file sfcdetails.txt

next run CheckSur http://support.microsoft.com/kb/947821
even if this tool won't resolve problem automatically it create logs:

C:\Windows\Logs\CBS\CheckSUR.log

System also create logs -there is log C:\Windows\WindowsUpdate.log but this log is mostly too big
So download FireGenUL Altair Technologies Ltd.
place this file in C:\Windows\System32 and restart computer
next run cmd.exe and type

firegenul

and then will create short *.htm report from WindowsUpdate.log placed in C:\Users\<your account> -report name FireGenUlReport.htm

All tree files:FiregenUlReport.htm,sfcdetails.txt and CheckSUR.log pack them and attache to post -if they will are to big to attache upload them on Speedy Share - upload your files here