Go to control panel, click on power & have a look at what your settings are, remember if you don't know what your doing, the most important button is cancel.
May be you should wear a mask, the computer might be fed up of looking at you.
Retlaw.
Shaz...I'm running Windows 7 so I am not sure if your machine will be the same....but you might want to try this.
Go into Control panel.
Choose power Options and go into this.
There should be something which allows you to change the 'sleep' pattern of your computer.
Hope this info is helpful to you.
Go into Control panel.
Choose power Options and go into this.
There should be something which allows you to change the 'sleep' pattern of your computer.
Hope this info is helpful to you.
Further down the page on this link that Less posted there is another link thats says how to disable sleep mode on windows xp
How to Disable Sleep Mode on Windows XP | eHow.com
if that does not sort it you may have to check the bios settings as some towers have power managment settings in there also, can send you instructions how to do this if need be
You might need to adjust the gangle spindle.
Now Micheal......it is not good to incur the wrath of Flashy...especially when she needs help with her techno things. Do so at your peril 
See...what did I tell you ??????
Ouch!
Or the mid bearing sprocketNah ... it's the foofoo valve, or maybe the muffler bearings ....
