need help

i got a new computer an my cousin tought me a lot about them mostly the basics but im learning more an it is very very slow an it skips alot when u play music like when u go on the web it starts to skip . neway i would …

im trying to delete stuff an it always says make sure it aint write protected what does that mean an how can i erase it? and whats a vids: xvid decompressor?

whats the best windows media player to get my is pretty old