Don't mind the VAC ban...recieved it a few years ago for using a mod which gave bloom-like effects for Half Life 1 based games. The mod is completely harmless, but since it modifies certain files it was automatically detected as some sort of hack. GG Valve...

A quick search on google for something along the lines of "hl1 bloom mod vac ban" should return plenty of results from people with the same problem. I tried petitioning the ban at the time but couldn't get any reply from them other than standard responses.

Link to the mod can be found below: