You don't and shouldn't remove updates as this in NOT what is causing you issues.
You're problem arises from all the programs that you have loaded in the background on startup.
A great way of reducing your overhead and cleaning your system all in one is by using
CCleaner.
It's a free App that removes junk files, cleans your registry and also can be used to remove any unneeded start up programs.
The offical way of turning off strt up programs is:
Start > Run > Type MSCONFIG > Startyp Tab > UNcheck unneeded programs.
IMHO CCleaner is alot easier to use and less dangerous.