Ping spikes on 5ghz/2.4ghz wi-fi only on one computer

Question

I have strange problem with Wi-Fi on my latop. I tried to use 5ghz and 2.5ghz - and it make no significant difference. When I ping my router it looks like this:

Pinging 192.168.0.1 with 32 bytes of data:
Reply from 192.168.0.1: bytes=32 time<1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
Reply from 192.168.0.1: bytes=32 time=65ms TTL=64
Reply from 192.168.0.1: bytes=32 time=167ms TTL=64
Reply from 192.168.0.1: bytes=32 time=175ms TTL=64
Reply from 192.168.0.1: bytes=32 time=88ms TTL=64
Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Request timed out.
Reply from 192.168.0.1: bytes=32 time=2381ms TTL=64
Reply from 192.168.0.1: bytes=32 time<1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=2ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=3950ms TTL=64
Reply from 192.168.0.1: bytes=32 time=8ms TTL=64
Reply from 192.168.0.1: bytes=32 time=126ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=10ms TTL=64
Reply from 192.168.0.1: bytes=32 time=12ms TTL=64

Ping statistics for 192.168.0.1:
    Packets: Sent = 26, Received = 25, Lost = 1 (3% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 3950ms, Average = 280ms

The spike occurse very unregullar, sometimes I can send 50 or more pings without it, and sometimes it happend few times in half minute like you can see above.

Now some details:

• I ping my router so it is not problem with my ISP.
• It happend only on one from 3 tested laptops, two of them were on Win8.1, one on WinXP.
• The lagging one is on Win8.1.
• Turning off antivirus, system firewall and even pinging in windows safe mode didin't changed anthing.
• I updated wi-fi card driver (it's realtek 8821AE) and the error is not fixed.
• Pinging localhost works fine, no spikes here, so it seems that network card is good.
• On Wired connection on this laptop I have stable, low ping to router but because of it's standard location I need wi-fi connection.
• System is also updated.

The question is - how to fix this issue? I know that wired connection is always batter for low ping and I can accept 1-5ms ping which I have on Wi-FI on two other laptops. I just want the same stability level on the third.

Thanks in advance for your help!