generic host process for win32 services

hello,
i have a "generic host process for win32 services" error
after i've connected to internet with adsl usb modem.
and my connection is lost till i shutdown and restart.

i tried lots of things, do a google search but couldn't solve.
when i restart the computer and do not dial for internet, no error occurs.
but when i dial and start to surf or download something it gives this error at different times.
sometimes the error occurs 10 minutes later sometimes 1 hour later.
when i dal to the internet my network connection icon
(near the time in the lower right corner) says limited connection or there's no connection.
i think that's beacuse it cannot receive ip from my ISP.
how can i solve this limited connection problem?

i removed the drivers
installed again, removed the drivers and installed the old ones.
do a virus scan with latest updates
. do a system restore but nothig changes.

i use windows xp sp2, with zyxel prestige 630-11 adsl modem.

the error i receive:
Generic Host Process for Win32 Services
EventType:BEX
P1: svchost.exe
P2: 5.1.2600.2180
P3: 41107ed6
P4: netapi32.dll
P5: 5.1.2600.2180
P6: 411093e4
P7: 0000a3c0
P8: c0000409
P9: 00000000

thanks in advance