Hard disk,help please(now)

Lovely people,hello.i am having this problem with my hard disk,and its really getting me mad:cry::sa::sa:.i have a 250gb hard disk on my system(DELL VOSTRO 1510 LAPTOP).on this very day i put on my laptop and i noticed it had no more free space on it (34gb free).it even wiped off all my documents when i tried scanning it(hard disk).
Now i bought another one (hard disk)250gb,thinking that was all,until yesterday night when i tried working on my system i noticed the same thing had happened with the new hard disk(about 2months old).
I am an I.T technician,and this is making me fell i don't know what i' m doing.please help me someone,solve this issue.
moz-screenshot.jpg
 

My Computer

System One

  • Manufacturer/Model
    dell/vostro 1510
    Memory
    176gb
Welcome
If you are losing free space
First run a full and updated anti virus scan
Second download and run a full updated malwarebytes.
Read this document
How to Fix Shrinking Disk Space in Vista » My Digital Life
Most space problems are due to a failing HD
Shadow image copies
or virus/malware

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My Computer

System One

  • Manufacturer/Model
    Dell XPS420
    Memory
    6 gig
    Graphics Card(s)
    ATI Radeon HD3650 256 MB
    Sound Card
    Intergrated 7.1 Channel Audio
    Monitor(s) Displays
    Dell SP2009W 20 inch Flat Panel w Webcam
    Hard Drives
    640 gb
    Cooling
    Fan
    Keyboard
    Dell USB
    Mouse
    Dell USB 4 button optical
    Other Info
    DSL provided by ATT
I have AVAST 5.0 installed on my system which i run regularly to scan for infections,i also have TuneUp Utilities 2011 installed and running,to help check for disk errors and stuff like:cry: that.
I even had to change my operating system from windows vista to wndows7.and besides its a new hard disk(2months old) we are talking about here.(remember the same thing is happening to two different hard disks bot 250gb each).pls help,my head is getting :sick:hot.:sa:
 

My Computer

System One

  • Manufacturer/Model
    dell/vostro 1510
    Memory
    176gb

My Computer

System One

  • Manufacturer/Model
    Dell XPS420
    Memory
    6 gig
    Graphics Card(s)
    ATI Radeon HD3650 256 MB
    Sound Card
    Intergrated 7.1 Channel Audio
    Monitor(s) Displays
    Dell SP2009W 20 inch Flat Panel w Webcam
    Hard Drives
    640 gb
    Cooling
    Fan
    Keyboard
    Dell USB
    Mouse
    Dell USB 4 button optical
    Other Info
    DSL provided by ATT
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