One of the AVG updates has proven to be a problem for several PC setups recently. Hard to narrow this down at this stage but it seems more prevalent on Windows 7 64 bit setups. Symptoms are PCs that will not boot after an AVG update, offering a Blue Screen Of Death (BSOD) on restart.
The problem is down to an AVG system file that is loaded at boot time – most notably Windows\System32\Drivers\avgidseh.sys
The technical fix is to rename all files in the \Windows\System32\Drivers folder that begin with “avg” to something else. We do this by running off a boot CD/DVD/USB. Basically, any boot disk that allows file management access can do this. Safe mode will not help here.
Example:
rename avgidseh.sys to pcrmbavgidseh.sys
rename avgldx86.sys to pcrmbldx86.sys and so on
Once done, restart the PC and AVG will no longer start. Use the uninstall program to remove AVG and reinstall it. The new updates do not appear to be affected so it should work as normal.
AVG offer a rescue CD that can do this as it includes Midnight Commander as a file management tool.Download it from here