winxp not working?

> It seems as though I am unable to intstall any kind of
> camera into my computer! It is a year old! Not only that
> it allowed me to install the same camera before all the
> updates where installed!! It says I can't uninstall them
> because it may affect everything! What happened? My
> computer is useless thanks to the updates!! I spent a
> lot of money and can't even use it the way I want. Who
> designed Win XP anyway?
> Does anyone else have this problem and how can I fix it!
> Every time I plug in a new divice (USB) it says there was
> an error while installing, not allowed to install. I have
> discs and drivers!!!!!! i am very frustrated at microsoft
> right now!!!!