Hi,
I'm also having trouble with Avast since yesterday I think.
I'm on Microsoft Windows XP build 2600.xpsp_2_rtm.04803-2158 service pack 2, home edition, japanese language.
I use automatic update for Avast 4.
When I try to re-boot after install, I just have time to see a black screen: the Windows logo screen with progress bar stops abruptly, and a black screen appears for 1tenth of a second.
I filmed the screen, the message is approximately
"bad_pool_caller" then "remove hardware or software, disable BIOS memory options (cache or shadow) ..." then this code (some zeroes are missing) STOP: 0x000000C2 0x000040 0x0000000 0x8000000 0x000000
I can't find no recent minidump files.
I looked at the forum (after having uninstalled AVAST), the aswtdi.sys file tip doesn't work with my system (eather with 28k or 31k file size).
I had to reboot to safe mode, uninstall and reinstall but when AVAST is installed I get the same reboot. I tried english, french and japanese version but it doesn't help.
what can I do now? I don't have no anti-virus installed any more...