I bought hl2/source a little while ago and it worked just fine... I decided to take a break and play some good old cs, but when i tried to get back into source, it said "This Game is not available at this time" Now i can't play source at all no matter wut i try.... :chainsaw: Wut do i do?
Have you reformatted your system? Or did you reinstall steam? If you haven't backed up your CS:S game yet locally there are any number of reasons that could happen.
See if it will let you re-download it. If it doesn't then steam thinks you still have the game installed and you'll probably have to contact them.