Lost Hard Drive Memory

hi, i have lost 40Gb of hard drive memory when I havent used it!!! I have tried to create more space by deleting things I had saved even before the memory went missing to speed up the pc slightly to allow the problem to be fixed. However I manage to free a little space and after a while i get a message saying i only have 100mb of space left and i havent done anything!!! I have the latest update of norton anti virus: after updating it and completing a scan it flagged up stareware. I have removed this using the software remove in the control panel i have also removed the file in c/ program files. my memory has stopped dissapearing but i still cant find whats using up the 40Gb. i have completed another antivirus scan and it says the pcs virus free.i have cleared the temp files and any unused programs. i have also had problems with sonic record now, i suspect this is because i dont have much memory but this was crashing before my memory dissappeared. i have read that when this crashes because it hasnt completed its task it may still be storing the tempery image in a working folder somewhere, i cant seem to find anything in the record now file in the program files for this. im not sure this is related to the memory issue but i thought id best give as much info as i could. i have also installed hijsck this and ran it, im not really sure what im looking at with it so i havent done anything else with this. As you can probably tell from this im no PC expert and im still practically a learner and im competley stuck with this!!!
Please help!
Thanx

 

Look in Norton protected files under the recycle bin.

 

if norton sees no virus then there isn't any probably, as long as it's up to date norton has always been very potent i answer you in the other thread please dont make double threads