Solved Steam doesn't Start

I use Steampowered.
Since a few Weeks, it starts, connects to Steampowered and closes.
I reinstalled it, but it doesn't help.
Problems started when I moved a Download to Top.
Any idea?
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Selfmade
OS
Windows 7 Professional 64 Bit
CPU
Intel Core i5-4590 @ 3.30GHz
Motherboard
Asus
Memory
16 GB
Graphics Card(s)
NVIDEIA GeForce GTX750 Ti 2GB
Monitor(s) Displays
Samsung SyncMaster B2240
Screen Resolution
1680 x1050
Hard Drives
1x 512 MB SSD Crucial CT512MX100
2x 1 TB Western Digital
Keyboard
Logitech G15
Mouse
Logitech
Internet Speed
16 MB
Antivirus
F-Secure Internet Security
Browser
Firefox
I suggest that you check with their community or their support. Steam Community
 

My Computers

System One System Two

My Computer

Computer type
PC/Desktop
OS
Windows 7 x64, Vista x64, 8.1 smartphone
CPU
Intel E8400 65W 64-bit
Motherboard
Gigabyte EP45-UD3LR
Memory
DDR2 2 x 2GB, 1GB x 2
Graphics Card(s)
XFX Radeon HD5750
Sound Card
AMD High Definition Audio; Realtek High Definition Audio
Monitor(s) Displays
iiyama prolite X2377HDS
Screen Resolution
1920 x 1080
Hard Drives
500GB 7200 rpm Seagate ST3500413AS 16MB, 500GB 5400 rpm Toshiba MQ02ABF050H 32MB, 200GB 7200 rpm Seagate ST3200820AS 8MB, 2TB 7200 rpm Western Digital WD20EZRX 64MB
PSU
Enermax Liberty Modular
Case
Antec P193 Midi Tower
Keyboard
Mionix ZIBAL 60
Mouse
Razer USB 2.0 Diamondback Mouse or Huion Graphics Tablet
Browser
Internet Explorer, Lunascape, Firefox, Opera, Avast Safezone
Try switching off the computer's Router, and then starting the Steam Client in Offline mode.

I found other suggestions under discussion here: Steam starts up then instantly closes :: Help and Tips


My younger brother has been good at school so I installed Steam on the PC so he can play. We were installing the brake kit and atv accessories on the TRX when he mentioned Steam sometimes crash and closes randomly on start. Hope the offline mode would work.
 

My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
Dell
OS
Windows 10 64
Solved

A program that spied the networktraffic where not complete uninstalled and disturbed the networktraffic.
Whithout it all works fine
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Selfmade
OS
Windows 7 Professional 64 Bit
CPU
Intel Core i5-4590 @ 3.30GHz
Motherboard
Asus
Memory
16 GB
Graphics Card(s)
NVIDEIA GeForce GTX750 Ti 2GB
Monitor(s) Displays
Samsung SyncMaster B2240
Screen Resolution
1680 x1050
Hard Drives
1x 512 MB SSD Crucial CT512MX100
2x 1 TB Western Digital
Keyboard
Logitech G15
Mouse
Logitech
Internet Speed
16 MB
Antivirus
F-Secure Internet Security
Browser
Firefox
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