the installation of MiKTeX 2.x - and off cause the update too - works perfect on my Windows 7 32 bit system ....
... if I don´t install the new pro-activ choice of the update from Avira Premium Security Suite Version 10.
If I install this new, wonderfull programm, it is not enough to suspend the anti-virus service.
No, I have to do a complete uninstall of the complete Avira system.
I can install MiKTeX 2.x , and do all updates too, after removal of the complete Avira program.
I tried to install Avira 10 without the pro-activ choice and the installation and update of
MiKTeX 2.x works perfect too ....... on my 32 bit system.
Sorry for the useless work,