Windows Vista

I ended up being able to get a free Vista upgrade for my laptop, and sometimes, it sucks..lol. After awhile of using the copy and paste, it won't let me use those functions anymore. Why? I have no idea, but it really bug the crap out of me, I have to close everything out and restart, and that's a big pain in the butt..lol. I hope this is a glitch or something, because I hate having to restart all the time.