C Drive keeps filling up

With what?
 

My Computer

System One

  • OS
    Windows 7 Pro 64bit [MS blue-disk set]
    Computer type
    PC/Desktop
    System Manufacturer/Model
    2 Acers & 1 Antec[?]
    CPU
    i7 in 2 Acers, i5 in desktop
    Motherboard
    Desktop w/Gigabyte
    Memory
    Two w/16GB, 1 w/8GB
    Graphics Card(s)
    Laptops GameWorthy; Desktop maybe GameWorthy
    Monitor(s) Displays
    flatscreens; 2 are BluRay worthy
    Screen Resolution
    1368x768; 1600x900
    Hard Drives
    1TB internals; 2 ext usb WD 1TB HDs
    PSU
    what's PSU?
    Cooling
    Regular plus external fans
    Keyboard
    desktio w/PS2
    Mouse
    desktop w/PS2
    Internet Speed
    DSL middle level [160?]
    Browser
    from Netscape 0.9 to FF 36
    Antivirus
    well-balanced, well-configured mult-layered defense is best
    Other Info
    From MS-DOS 3.3, MS-DOS 6.22, from Windows 3.1 to WFW 3.11 to Windows 95-98SE, now to Windows 7 Pro.
    Security for now: Windows 7 Firewall, Emsisoft AM, MSE [scan-only], SpywareBlaster, Ruiware/BillP combine
A little more info please. Is it due to you saving files there or is it mysteriously filling for an unknown reason?

Have you tried a disk cleaning operation using Windows Disk Cleanup or another tool such as CCleaner?

Do you have another drive (such as a D: drive) that you could move some files to?
 

My Computer

System One

  • OS
    W10 Pro (desktop), W10 (laptop), W10 Pro (tablet)
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Home built i7-8700K, Hp Envy x360 EVO Laptop, MS Surface Pro 7
    CPU
    3.7Ghz Core i7-8700K, 11th Gen Core i7-1165G7 4.7Ghz, 10th Gen Core™ i5-1035G4 1.1Ghz
    Motherboard
    ASUS TUF Z370-Pro Gaming, HP, MS
    Memory
    16G, 8G, 8G
    Graphics Card(s)
    AMD Radeon RX580, Intel Iris X Graphics, Intel Iris Plus Graphics G4
    Sound Card
    ATI High Definition Audio (Built-in to mobo)
    Monitor(s) Displays
    Dual Samsung U32J59 32 inch monitors, 13.3" display, 12.3" display
    Screen Resolution
    3840x2160 (Desktop), 1920x1080 (laptop), 2736x1824 Pro 7
    Hard Drives
    500GB ssd boot drive with 2 & 10TB Data (Desktop), 512GB ssd (laptop), 128GB SSD (tablet)
    PSU
    Corsair CX 750M
    Case
    Antec 100
    Cooling
    Coolermaster CM 212+
    Keyboard
    IBM Model M - used continuously since 1986
    Mouse
    Microsoft IntelliMouse
    Internet Speed
    665Mbps/15Mbps down/up
    Browser
    FireFox, MS Edge
    Antivirus
    Defender on all
    Other Info
    Retired in 2015 after working in the tech industry for 41 years. First 10 years as a Technician, the rest as a programmer/software engineer. After 1 year of retirement, I was bored so went back to work as a Robotic Process Automation Consultant. Retired for 3rd (and final) time in 2019.

My Computer

System One

  • OS
    Windows 10 Pro X64
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Lenovo IdeaCenter K450
    CPU
    Intel Quad Core i7-4770 @ 3.4Ghz
    Motherboard
    Lenovo
    Memory
    16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
    Graphics Card(s)
    Intel Integrated HD Graphics
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    HP h2207
    Screen Resolution
    1680x1050@59Hz
    Hard Drives
    250GB Samsung EVO SATA-3 SSD;
    2TB Seagate ST2000DM001 SATA-2;
    1.5TB Seagate ST3150041AS SATA
    PSU
    500W
    Keyboard
    Wired USB
    Mouse
    Wired USB
    Internet Speed
    3GB Up, 30GB Down
    Browser
    SeaMonkey
    Antivirus
    Windows Defender; MBAM Pro
    Other Info
    UEFI/GPT
    PLDS DVD-RW DH16AERSH
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