Computer can't/won't open any programs

I'm unable to open any programs besides Internet explorer. Everything I open just ends up crashing with the error (The host application has stopped working) I can't system restore because it says my c drive is corrupt and I can't chkdsk to see what needs fixing.

use installation disc to restore

I suggest you try the steps below to restore
1.After you manage to press either F8 or the combination at the right time, you still cannot get straight to the options and Windows will try to diagnose and repair the system which could take considerable time if it wants to check your hard drive for errors. If you’re lucky, it might actually fix your problem, but always said it cannot repair the PC for us.Eventually you should end up at a screen which offers Shutdown or Advanced options, press Advanced options -> Troubleshoot -> Advanced options -> System Restore.

2. Boot the computer using the Windows DVD or USB flash drive, make sure to press any key when prompted. Choose the language and keyboard layout, click Next and then click Repair your computer at the bottom.
Click Troubleshoot -> Advanced options -> System Restore.
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