hello to all!!! new to this not a techie but will give it a bash.i have a dell dimension c521 the other day i downloaded update program for virgin pc guaurd anti-virus software.after install i couldnt get onto internet,so i did a system restore, everything was resetting then the system crashed,it will not boot up now,i have tried to start in safe mode but when it goes by the microsft load light bar (before vista logo) the screen is just blank left it for hrs nothing happens.i would appreciate any help . cheers tam