Context menu - problem using TC with Vista 64 bit

[m^2]

I have problem with context menu in TC (right click menu). In Windows explorer's context menu I have position with 7-zip and AVIRA Antivirus scanner but they aren't in context menu under TC or TC UP.

How can I resolve this problem for TC UP 4.2 and Vista HP 64bit?

That's a Windows limitation, 32bit programs (TC) can't load 64bit dlls (these shell extensions). However, if I'm not mistaken, it's possible to have both 32bit and 64bit versions of shell extension installed on a single machine.

Contact 7zip and Avira authors and ask them to include 32bit shell extensions too.

As for now, you can uninstall 7zip and install 32bit version of it, you'll loose Explorer shell extension though.