Cant shutdown the machine

Hi guys :smile:

sometimes my pc wont shut down....it happens only when Im connected to the internet...here's what happens:

Usually after a surfing session, I just disconnect (ive a adsl connection) and shut down the machine.
However, if my "sessions" are longer, I cant disconnect properly.
When I hit the "Disconnect" button, the connection tray icon seems to freeze. I cant click anymore on it, and I cant reconnect again, unless I reboot.

However, the real problem is the following:

When I try to shut down or to reboot the machine after this "disconnect" incidents happens, my pc seems to take ages to close, then a "terminate application" for the connection tray appears and after I tell it to terminate the normal shut down procedure continues until it gets to the "Saving settings underway"...it just freezes, the hd stops working.

So I need to cut the power or make an hard reboot.

This happens quite often, since I often leave the pc connected for hours...instead it doesnt occur when my connection sessions are short, so this led me to belive that it is a matter of connection time which determinate the freezing. Moreover, it ALWAYS happens if I upload stuff.

I even called the direct support for my isp, but they said there was a incompatibility somewhere with the software and left, so Im clueless.

Ive a p4 3000mhz, 1024 ram, ati x550, proper power supply, and Im almsot sure its free form malware.
Ive a fully updated AVG free antivirus, I make spybot scans often and Ive learned to use Hijack this...the modem is a DataWay usb modem

Any ideas??:sigh: