Finder And All Other Apps cannot be opened...

Question

First and foremost, I'll give you the specs of my machine:
iMac i5 (2010)
4Gbs of RAM
1333 Mhz
10.6 (Snow Leopard)
So alas, onto the actual problem. My Mac will start up (kinda slower than normal), and will eventually reach the main screen with the dock and everything. Though, the top bar with the clock and magnifying clock is absent, and worst of all, NONE of my applications can be opened. All of the Error Messages read as follows, "Finder Quit Unexpectedly". The only thing that really sticks out is the thing that happened with Logic (yet ANOTHER problem arises). Logic's startup screen STOPPED at, "Initializing Audio and Music Services". I'm fairly convinced that it's something rooted there (but I could be wrong). Help pretty please!!!!! Any and ALL help is GREATLY APPRECIATED

Answer 1

Disconnect all peripherals from your computer. Boot from your install disc & run _*Repair Disk*_ from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select *Disk Utility.*
Select the disk or volume in the list of disks and volumes, and then click *First Aid.*
Click _*Repair Disk.*_
Restart your computer when done.
Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751 and restart your computer.