Team Fortress 2 Error

Hello,
I am getting very frustrated, and anoyed because - Everytime i try and start it up, i get an error coming up saying "hl2 has encounted a problem and needs to close".
Here is a list of everything i have tried;
-Reformatting my whole pc
- Running Regcure and RegistryBooster
- Reinstalling steam and Team Fortress 2
- Reinstalling Drivers
- And installing lastest version of DirectX

Now this all started when my 300WATT PSU blew, and then i got a new one wich is now a 600WATT, and when i managed to start up my pc, i was getting the blue screen of death!.. But i have fixed that now, but im not sure if i have a problem with my hard drives or not? Since i cant run any games that have the source engine for Hl2, Eg; CSS, HL2, TF2 Etc.. But i can run other games. Please can anyone help me, i have been trying to fix this for months on end, and im having no luck

 

Hey,
I am using windows XP Professional. And yes i just checked my device manager and i have 2 yellow question marks on; Multimedia Audio Controller and raid Controller.
Urrrm how do i look at my Event Viewer in Steam? - It is "hl2 has encounted a problem and needs to close"
I have Avast - the newest one installed. Strange tho, when i scan with it, says i have no viruses.. But i know i do :S so i dont quite get that either.. I think i have many problems with my pc Since my psu blew, and had to replace ;/
And i have reinstalled steam many times, and done that verify integrity game cache many times also.

I hope that helps, Thanks

 

Wait, what? You have a virus on your PC?

That would explain some of your problems. Not all of them, but some. If you are positive you have a virus infection, go through the steps in this thread. Be sure to follow the instructions to the letter, every single one of them, since that makes it much easier for the malware fighters in the forum to help you. After you've posted your logs, be patient. The malware fighters are a small number of volunteers and they work threads in the order they were posted. It might take a couple of days, but they'll get to your logs eventually and they are the best ones out there... especially when you consider that they won't charge you a penny for the help.

 

you might want to download a program that will ether erase your hdd or test it (i use killdisk when i erase my hdd) http://www.killdisk.com/ what make and model is your hdd?
you might want to check your hdd's manufactor and see if they have any utilities to test your hdd.

 

Hey Guys,
Thanks for all of your help, i have told my dad about my problem, and he says i have a software problems cos i have to go into 'SERVICES.MSC' and start Windows Installer everytime i want to install something onto my computer, and we both think the Windows i have on my pc is damaged or something, so we are going to try and reinstall windows again, with a different copy of windows. To see if that helps if it does not help then i am going to try all of your idea's thanks If u do have anymore idea's please let me know Every little helps Thanks