Ralston18 :
If by "clean my pc" you mean that you opened it up to blow out dirt, dust, etc. you may have bumped the network adapter or loosened the Ethernet cable connection.
I will add the suggestion that you run "ipconfig /all" and take a close look at the network adapter being used and how it is configured.
i downloaded the Anti virus to clean a weird file that i couldn't find alone. WDF Sound. something like that, it just slowed my pc down. the anti virus cleaned it. and i didn't cleaned the PC Physically
The ipconfig/all
C:\Users\Dor>ipconfig/all
Windows IP Configuration
Host Name . . . . . . . . . . . . : Dor-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Ethernet 2:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller #2
Physical Address. . . . . . . . . : 30-5A-3A-0D-D3-9D
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : 18-D6-C7-04-38-0E
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::35ad:bd43:2d6e:c4e0%11(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.196.224(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 186177223
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-21-0B-A4-CC-30-5A-3A-0D-D3-9D
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter Teredo Tunneling Pseudo-Interface:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes