problems connecting to the internet

[readermaniax]

have a friend who has problems connecting to the internet.
His config is : P 4,60gb hdd,windows xp pro,D-link external modem .
Software: Kaspersky antivirus personal v5.0.372,zonealarm firewall pro.

Problem: He has a problem connecting to the internet i.e. as the modem is just about to connect to the net the computer restarts.
Initially i assumed it was a virus so i scanned the comp after updating his virus def's thru the local folder update in kaspersky.
However it showed no viruses . Again i tried connecting the internet but it would not connect (BTW he has a dial-up mtnl connection) and this happened a couple of times. I also tried scanning his comp with spybot S&D and ad-aware with no spyware detected. Otherwise the comp works perfectly well.
Please help.

i aslo d'ont know if there is any trigger, I did scan the pc with both Spybot and ad-aware.They did not detect anything. I tried hijack this as well but to no avail.
I also installed the latest drivers for his modem i.e. D-link DFM 560ES 56kbs model.
The only program installed prior to the incident was spyware blaster.
I also noticed that the task manager showed 4 instances of svchost.exe with 2 being identified as local services and 2 as network services, while earlier there were only 2 instances. I installed process explorer which i got from chip cd to see if any one of those was the guilty party. But through it's detailed info i came to know that these are windows processes.
By the way what are these processes and what are their functions.
Any other solution would help.

 

[Choto Cheeta]

try after loding the SP1 or SP2... see whats happens... also check PSU.....

 

[QwertyManiac]

Process File: svchost or svchost.exe
Process Name: Microsoft Service Host Process

Description:
svchost.exe is a system process belonging to the Microsoft Windows Operating System which handles processes executed from DLLs. This program is important for the stable and secure running of your computer and should not be terminated.

Note: svchost.exe is a process which is registered as the W32.Welchia.Worm. It takes advantage of the Windows LSASS vulnerability, which creates a buffer overflow and instigates your computer to shut down. To see more information about this vulnerability please look at the following Microsoft bulletin: *www.microsoft.com/technet/security/bulletin/ms04-011.mspx

This is a registered security risk and should be removed immediately. Please see additional details regarding this process

hope this solves ur problem...

 

[tuxfan]

Remove Dial Up Networking and re-install it.

 

[mariner]

try creating a new dialup connection and see !

 

[Nemesis]

Does your friend get a BSOD? If he does, please post the error code he gets.