[Petya V4sechkin]

1. Какая сетевая карта? Попробуйте обновить драйвер.
2. Приведите ошибки из журнала событий -> Журналы Windows -> в разделах Система и Приложение (правой кнопкой мыши -> Копировать -> Копировать сведения как текст).
3. Выложите результаты выполнения в командной строке (cmd.exe)
   
   Код:

   ipconfig /all
   nbtstat -n

4. Для эксперимента отключите антивирус и сторонний файрвол.
5. Выполните инструкции
   Как определить, является проблема системной или вызвана сторонним приложением/службой
6. Посмотрите в свойствах сетевого подключения, какие сторонние клиенты/протоколы установлены.

[veter48]

1) Обновил, не помогло.
2)
Log Name: System
Source: Microsoft-Windows-DNS-Client
Date: 2013.03.18. 17:31:06
Event ID: 1014
Task Category: None
Level: Warning
Keywords:
User: NETWORK SERVICE
Computer: Toshiba
Description:
Name resolution for the name wpad.lan timed out after none of the configured DNS servers responded.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-DNS-Client" Guid="{1C95126E-7EEA-49A9-A3FE-A378B03DDB4D}" />
<EventID>1014</EventID>
<Version>0</Version>
<Level>3</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x4000000000000000</Keywords>
<TimeCreated SystemTime="2013-03-18T15:31:06.599216200Z" />
<EventRecordID>94353</EventRecordID>
<Correlation />
<Execution ProcessID="1116" ThreadID="148" />
<Channel>System</Channel>
<Computer>Toshiba</Computer>
<Security UserID="S-1-5-20" />
</System>
<EventData>
<Data Name="QueryName">wpad.lan</Data>
<Data Name="AddressLength">16</Data>
<Data Name="Address">02000035C0A800010000000000000000</Data>
</EventData>
</Event>

3) ipconfig /all
Windows IP Configuration


Wireless LAN adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . : lan
Link-local IPv6 Address . . . . . : fe80::fc36:19d7:6d05:1cf1%12
IPv4 Address. . . . . . . . . . . : 192.168.0.103
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.0.1

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : lan

Tunnel adapter isatap.lan:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : lan

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:953c:30ce:36b7:3f57:ff98
Link-local IPv6 Address . . . . . : fe80::30ce:36b7:3f57:ff98%13
Default Gateway . . . . . . . . . : ::

Tunnel adapter isatap.{8625D3D5-0887-425A-9AB6-BDF1046DBC47}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

C:\Users\Sarmite>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Toshiba
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : lan

Wireless LAN adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
Physical Address. . . . . . . . . : 70-1A-04-11-8A-D6
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Realtek RTL8187B Wireless 802.11b/g 54Mbp
s USB 2.0 Network Adapter
Physical Address. . . . . . . . . : 70-1A-04-11-8A-D6
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::fc36:19d7:6d05:1cf1%12(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.0.103(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : pirmdiena, 2013. gada 18. martā 17:55:33
Lease Expires . . . . . . . . . . : otrdiena, 2013. gada 19. martā 17:55:34
Default Gateway . . . . . . . . . : 192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DHCPv6 IAID . . . . . . . . . . . : 225450500
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-15-72-24-8D-00-26-22-45-19-6E

DNS Servers . . . . . . . . . . . : 192.168.0.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Realtek PCIe FE Family Controller
Physical Address. . . . . . . . . : 00-26-22-45-19-6E
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.lan:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

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
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:953c:30ce:36b7:3f57:ff98(Pref
erred)
Link-local IPv6 Address . . . . . : fe80::30ce:36b7:3f57:ff98%13(Preferred)
Default Gateway . . . . . . . . . : ::
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter isatap.{8625D3D5-0887-425A-9AB6-BDF1046DBC47}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes


nbtstat -n
'nbtstat' is not recognized as an internal or external command,
operable program or batch file.

4) Не помогло
5) В Safe Mode тоже глючит.

[Petya V4sechkin]

veter48, выложите логи RSIT.

Обновил, не помогло

Какая сейчас версия? Диспетчер устройств -> свойства Realtek RTL8187B Wireless -> вкладка Драйвер.
P. S. Попробуйте заменить сам Wi-Fi адаптер.