DO NOT RUN with a steam version of this game, it crashes HL2. You have to have the DVD or CD version, so search EBAY and get one. I doubt any retailer is still gonna carry this OLD game when there are so many newer GOOD games.
Different trainers have to be made for Steam versions of games, due to not having a disk. Memory storage is different, and trainers have to intercept and edit that memory. If the trainer can't edit the right files, it won't work. This usually results in a crash.
This is a fairly old game, I doubt you'll be seeing a Steam trainer for it.
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In short, I'm not a Trainer Maker. I don't like trainers, and I don't use them. I write FAQs.
Also, I only contribute FAQs and Walkthroughs to the site. This doesn't give me power over PWizard.
There are tools out there to make your own Trainers though. You might look through them. And if you make a good trainer, you might even get it accepted here. I know some members have submitted trainers to CHU.
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He didn't mention a trainer. He's saying that HL2 is crashing (his steam version). I have both a retail disc version and a steam download version. Both work ok here, and always have. I suspect there is something wrong with yours. Try verifying the integrity of the game cache. You can do that from some options that appear when you right-click the title in steam. Also make sure it is fully up-to-date. Failing that, I would delete the local files and re-download. Update your graphics drivers while you're at it.
I have the latest version of EVERYTHING. I just got windows 7, and ALL my Steam games had to be re-downloaded, I had no issues with the cache. So what else can I do???