Sorry Ash, got nothing.

If it was running OK and then started acting up, try a system restore to a point where it was running well.
If it always acted up, but only now the acting up is more pronounced, try to get the variable that changed and change it back.
If your computer is a netbook of some kind, or has an Atom processor, head to the nearest trash can and dump it in quickly.

It would help us if you laid down the specs and/or type of computer to see if you are not on something truly underpowered that would choke on a simple download or playing a youtube vid.