Would you help me to remove mebazat virus from my computer, please ?

Here are Symantec's removal instructions for two variants of Mebazat:
W32.Mabezat.A - Symantec.com (http://www.symantec.com/security_response/writeup.jsp?docid=2007-111202-0601-99)
W32.Mabezat.B - Symantec.com (http://www.symantec.com/security_response/writeup.jsp?docid=2007-120113-2635-99)

If you're using another virus scanner, its vendor should have their specific instructions on their web site.

Here's a standalone free utility from Sophos that will do the trick, too:

Sophos Anti-Rootkit - Free rootkit detection and removal (http://www.sophos.com/products/free-tools/sophos-anti-rootkit.html)