Big Problems?

I am running xp and when i go into System restore there are no restore points at all.
I also have games that wont delete at all.
Also my stand by button is shaded out and cannont be used and my add\remove programs button is missing and some of the icons in contol panel when i click on them NOTHING happans i would appreciate any help Thank You i am running a 2.6ghz celeron with 256 mb and 80 gig hard drive