Windows Time clock going twice the speed

The computer is custom build, no pre-installed windows.

I had windows 7 about a year ago, and had this problem then I went to windows 8, everything was fine but I decided to come back to win7 and the problem come back…

So I did a clean Windows 7 install, all up to date and then out of the blue a problem appeared.

Windows clock sometimes goes twice the speed (1 secound = 0.5 secounds in real time) and when it does and auto synchronize and reaches the time it was before for example (IRL it was 12:00 but the Windows clock says 12:10, so after synchronize it goes to normal 12:00, but when it goes to 12:10 my LAN turns off, when I do diagnose it displays that: ("Local Area Connection" doesn't have a valid IP configuration) and internet comes back).

The BIOS clock runs fine, the battery is fine (remember I just came from windows 8 that I used for 6 months and everything was fine. Also used windows before that and no such problem occurred)

I tried restarting the service and configure it, nothing helps…

I tried all the solutions I could find on the Internet like

 net stop w32time 
 w32tm /unregister 
 w32tm /register 
 regsvr32 c:\windows\system32\w32time.dll 
 w32tm /config /manualpeerlist:time.windows.com,0x4 /syncfromflags:MANUAL 
 net start w32time

even did a sfc /scannow and it found nothing wrong

Nothing helps… I cant do anything online because the time keeps going up and Internet crashes…

I don't want to spend another few hours to reinstall Windows and find out its still there…

The drivers are installed.

I am guessing its a software problem, but can't figure out what does it.

EDIT: The thing is I had windows 7 before and it worked fine until one day it just started to have this time problem.