Rdbss.sys BSOD

Hi all,
I'm suffering of an annoying problem on Windows XP Sp2, always
up-to-date with security patches, firewalled and virus proteted by AVG
(always updated as well).
Briefly, when my USB ADSL connection is on (no matter whether I've
been working or not with internet applications), the PC hangs in an
odd way: everything *looks* normal, but the connection isn't working
anymore and when I try to switch the connection off, I realize that
the whole usb I/O isn't working anymore.
I can open some O.S. forms (i.e. control panel, etc.), but not others
(i.e. task manager). If I try to run other applications a message
similar to the following appears:

"cannot find '/idlist,:xxxx:yyyy,'. Make sure you typed the name
correctly, and then try again"

Poking around the event viewer I can find some errors thrown by "svr",
ID 2019. But as long as I switch off that svr service, the problem
remains, so it's likely to be a consequence rather than a cause.
However, when I try to restart the system, I receive a BSOD with
0x00000D4 stop code, indicating rdbss.sys as the culprit.

What I already did:
=> I checked that no hw/sw installation have been carried out recently
=> I switched off all the services that aren't microsoft using
start->run->msconfig->services->hide all MS Services->disable all
=> I extracted the original rdbss.sys from the WinXP-SP2 original CD
=> I checked for viruses with AVG, apparently no problem

Now that the obvious things didn't work, I'm pretty puzzled about how
to proceed. Any suggestion?

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