Why does every thread I start seem to disappear?

System Manufacturer/Model Number: Dell Dimension E521
OS: 64-bit Windows 7 Home Premium w/ SP1
CPU: AMD Athlon 64 X2 5600+ Brisbane 65nm Technology
Motherboard: Dell Inc 0HK980 (Socket M2)
Memory: 4.00 GB Single-Channel DDR2 @ 200MHz
Graphics Card: 64MB NVIDIA GeForce 6150 LE
Sound Card: Sigmatel HD Audio
Monitor(s) Displays: Dell E176FP
Screen Resolution: 1280 x 1024
Keyboard: Dell Standard Keyboard
Mouse: Kensington One-Button USB
PSU: Dell, I guess?
Case: Dell CoolQuiet
Cooling: Fan
Hard Drives: Internal 78 GB Western Digital; External USB 931GB HP
Internet Speed: 1.5Mbps Max. Download / 256Kbps Max. Upload
Other Info: Kodak ESP 3250 All-In-One Printer; Altec Lansing BXR1220 USB-powered Speaker System; Westell 6100 DSL Modem; Tripplite Surge Protected Power Center

Computer Type: PC/Desktop
System Manufacturer/Model Number: custom build
OS: Windows 10 64bit
CPU: AMD Phenom II X4 925 (Deneb)(2.8GHz) OC 3.4GHz
Motherboard: M5A78L-MLX Plus
Memory: Corsair Vengeance DDR3 4GBX2 (8192MB)
Graphics Card: XFX HD 6870 1GB (OC)- 940MHz core, mem 1150MHz
Monitor(s) Displays: Vizio 26' 1920x1080 / Acer 1336x768
Screen Resolution: 1920x1080 60Hz /1336x768
Keyboard: Razer DeathStalker
Mouse: Logitech Optical Gaming Mouse G400
PSU: CORSAIR CX600 600w
Case: AZZA Orion 202 EVO
Cooling: cooler master hyper TX3 cpu cooler
Hard Drives: Kingston Digital 60GB SSDNow V300/500gb HDD Western Digital 7200rpm (/WD 160GB HDD 7200rpm
Browser: Firefox
Antivirus: Defualt on win 10
Other Info: cpu is overclocked in bios

Computer Type: PC/Desktop
System Manufacturer/Model Number: Systems by SmartEyeball
OS: 8 Pro x64
CPU: i7 3770K 4.6GHz
Motherboard: ASUS P8Z77 WS
Memory: 16GB G.Skill Trident X 2666mhz
Graphics Card: x2 EVGA 780 Ti Superclocked SLI
Sound Card: SB X-FI Surround 5.1 PRO USB / ATH-AD900 Headphones
Monitor(s) Displays: x3 Dell U2410 / 58" Samsung
Screen Resolution: 5760*1200/ 1920*1200
Keyboard: Topre Realforce // Ducky Shine MX Black // Filco Ninja TKL
Mouse: Thermaltake Theron (Highly Recommended) + Razer Imperator
PSU: Silverstone Strider Evolution 1200W
Case: Thermaltake Level 10 GT Snow Edition
Cooling: Noctua NH-D14
Hard Drives: 2x Intel 520 240GB (RAID 0) * 2x WD Caviar Blacks 2TB (RAID 0) * 2TB WD Caviar Black * Sony Optirac DVD
Browser: IE, FF, WaterFox
Antivirus: MSE
Other Info: GT Extreme V2 Sim Racing Cockpit + 40" LCD and K/B Mouse stand ▼ Fanatec CSR Elite Wheel + Clubsport V1 Pedals + CSR shifter/7G-H ▼Saitek X52 Pro ▼ TrackIR 5 Pro Buttkicker v2 Seat Rumbler with Dedicated 5.1 and Sub Woofer attached to frame ▼ = Bloody Big Grin

Computer Type: PC/Desktop
OS: Windows 10 Home x64
CPU: INTEL Core i5-750 Quad-Core 3.37GHz
Motherboard: ASUS P7P55D
Memory: HyperX Fury Black Series 8GB (2 x 4GB) 1866Mhz
Graphics Card: EVGA GeForce GTX 750 Superclocked 1GB 128-Bit GDDR5
Monitor(s) Displays: LG 32MA68HY 32" IPS
Screen Resolution: 1920 x 1080
PSU: ANTEC TruePower New TP-550, 80 PLUS, 550W
Case: ANTEC Three Hundred Illusion
Cooling: COOLER MASTER Hyper 212 Plus, 4 x 120mm 1 x 140mm Noctua's
Hard Drives: Samsung 840 Evo 120GB, SEAGATE 500GB Barracuda® 7200.12, SATA 3 Gb/s, 7200 RPM, 16MB cache
Internet Speed: 85 + Mbps
Browser: Vivaldi
Antivirus: Avast