LAN Trouble

Hi frends,
I have a small but weird problem going on. Am using airtel connection which is connected via a beetel modem and have two LAN switches in between now. the problem is every 5 min or so my LAN freezes i don't have any action going on i have to disable my LAN and re-enable it and it works fine its causing a lot of trouble to me. and rest of the machines on LAN are working fine its just with my PC.
I wud appreciate any suggestions

(Man i had to do the disable+re-enable thing at least thrice while i write this thread)

Which is your current AV software? Also have u enabled DHCP in the router?

Replace your LAN card at the PC(which has the trouble)... Check it & feedback!

the problem is every 5 min or so my LAN freezes

Can you connect your PC ONLY to Modem and test again ?

Post ipconfig /all of your PC.

this seems like a windows problem to me.. virus/spyware etc..

i use NOD32 Antivirus

i have given the ipconfig /all below

Windows IP Configuration
Host Name . . . . . . . . . . . . : PC6
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . : Atheros L2 Fast Ethernet 10/100 Base-T Controller
Physical Address. . . . . . . . . : 00-1F-C6-A2-76-63
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.3
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 192.168.1.1
Lease Obtained. . . . . . . . . . : Friday, February 27, 2009 9:02:21 AM
Lease Expires . . .. . . . . . .: Saturday, February 28, 2009 9:02:21 AM

and DHCP is enabled in router.
No its not possible to change the switch or connect PC directly to modem
I too doubt windows but not able to find any weird apps running probably anybdy noticed any virus doing this

Guyz the prob is freakin me out plz help me guyz

have you looked in taskmanager for strange processes ??

via a beetel modem

Under Management do you have the menu item
tr_069 client. If available disable it.

In access control select only GDMT/Glite/T413 and bitswap enabled. Uncheck rest.
Befor this check under statistics ADSL data. and report
snr attn line speed mod selected.
If adsl2+ uncheck in Access control page.
http://i19.tinypic.com/6kqygzt.jpg

checked task manager too nothing suspicious there

and am not clear for above reply. The settings in my router where same as in ur image but text that you have written is a bit confusing do i have to check adsl2+ enabled or disable it

Before this check under statistics ADSL data.......

http://i23.tinypic.com/24v4p4j.jpg
This page shows the mod selected.

If it is aDSL2+
Un check in this page.
http://i19.tinypic.com/6kqygzt.jpg
Save
Reboot
Check again

Para two:

rest of the machines on LAN are working fine its just with my PC.

Your computer/PC :

What is selected in the Ethernet card ( Advanced ) ?/
START/Network/LAN/Properties
in TCP/IP top : ethernet card configure advanced compare with other system/s.

Para three :If PCI slot available try another ethernet card in your PC ( instead of the [built in (?)]
Atheros L2 Fast Ethernet 10/100 Base-T Controller )
Update drivers.
Google search
Atheros L2 Fast Ethernet 10/100 Base-T Controller

Yes try with another LAN card...

I suggest uninstall drivers and reinstall also..