I had a similar kind of problem in past few months, where my computer started running really slow, I too downloaded many free applications for registry clean, registry defrag, disk defrag, junk cleaners and startup cleaners,On few forums I read about "Advanced System Optimizer" v3.0 from some company named systweak, it had all the individual applications under one name so I thought to give it a try and downloaded their trial versions. now computer is running really good.And it is working well so i purchased it.For me it is a complete optimizer. u can also try this it is available at cnet.

hey buddy dnt panic i hav something for u.Here are the steps that can help u to recover the data. You have to use some tool to recover the data.

1. Install a recovery tool on some other system
2. Now place ur crashed disk as a secondary disk on this other system
3. Select ur crashed disk from the partition and scan with the recovery tool to recover the data.
If u wanna give try then I can suggest you 1 such tool that I used once" Advanced Disk Recovery". You can try the trial version, and if satisified can purchase it.u will get it from cnet