[lol leegendary]

Well the problem is that it is slow and i think they have some unwanted virus on there which wont leave even tho i do system recovery and many other virus protection program has told me there was no errors.I cant reboot bc my dvd drive wont work it stills open but the light.The only time my computer work finely is after a update or recovery.Please help me with this problem?My computer is a acer extensa 5620 and has windows vista.

 

[spunk.funk]

my dvd drive wont work it stills open but the light

I'm not sure what you mean by this?
What is the make and model of your computer? You may have a Recovery Partition on your computer. If you start up your computer, you may have a quick message over the logo that says Press (key) to Enter Recovery, sometimes this is F11. If so, this will set your computer back to Factory Defaults. This will remove all personal data, so backup first.
If you do not have a recovery partition, then read up on the link in my signature PC Running Slow? And try those things.