When asking for support, the first thing the TSS staff will ask you about is the version number and build of your EE site. Make sure you include it in every post.
To determine what build/version you are using, take a look at the footer of any control panel page.
For EE2.x:
For EE1.x:
When reporting back the version, post
EE 2.1.3 build 20101220
-or-
EE 1.7.0 build 20101018