Search bar pops up randomly

Hello everyone !
I recently started to face a very annoying problem...the search bar from windows 10/8.1/8/7 all of them iv'e tried were on X64 built, start to pop up. The bottom left search bar pops up randomly, at any time. It's very annoying. I thought that the problem might be from my keyboard so, I changed the keyboard. The problem didn't stop there, I have changed 3 keyboard, 1 brand new. After that I thought that I might have a virus so, I took several antivirus software's for a test:
1. Malwarebytes
2. Avast
3. Bitdefender
4. Norton
5. Kaspersky.
After a week of scans and waiting, all of these software's gave me the same results: No virus have been found on your device/computer.
And don't think I am dumb or using the pc from yesterday, I installed every software separately so, there couldn't be any encounter between them.
I also reinstalled the bios for the motherboard, no result.
Here are my PC specs, not the best, but not the worst either:
CPU: AMD FX(tm)-8320 8 core
GPU: AMDRadeon (TM) r9 380 series
RAM: 4 GB DDR3-1600(PC3-12800) SDRAM/SAMSUNG x2 (8GB in total)
M.SSD: Kingston SA1000M8240G
Motherboard: ASROCK 990FX KILLER
PCU: 950W Gold from Corsair, I know it wasn't needed, but why not :)
If you have an idea why this happens or a solution, please do not hesitate to answer !
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