ok, sorry for all the confusion,
I added some more software but added it to my ext hard drive so would'nt have expected c drive to go up again. I also cut n pasted some programmes to my ext hard drive too from my c drive.
I am using avast antivirus.
In response to match i keep all o my audio/video/photos files on an ext hard drive so there isnt much in there but I will still do that anyway to see if it helps.
Its not the greatest laptop in the world i know (acer inspire5315) i just wanted to see if there was a solution rather than buy a new laptop.
thanks to all by the way.