Help! I need some advice on my Windows Updates

[swaghauler]

I just received a Windows Security update to my computer on Tuesday night and now I'm having ALL KINDS OF TROUBLE. My computer (an older HP using Windows 7 with all the updates) got this download and now my CPU is running at 25% all the time, my keyboard lags when I type and I cannot use GOOGLE Chrome anymore (my default web browser after Bing came out). I'm back to Internet Explorer and my Windows keeps trying to upgrade me but my system is "obsolete." I was looking to buy a newer computer (once i can find a REPUTABLE computer shop), but I don't want to lose the work I have on this computer.

So here's my question...

Given that I cannot log into just any website or link (it took me 20 minutes to log in here), How in the hell do I uninstall the latest Windows updates that have caused all this havoc?