How to restore my apps on my iPhone?

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I backed up my phone the other day and without asking me, the phone installed the new OS. My phone is the 4s It also deleted all of my apps that I have installed. How do I restore my apps they way they were?

I know, I should have gotten a better phone than the iPhone but I have what I have for now.

After updating did you set up as New Device?

look at this location:- C:\Users\user\AppData\Roaming\Apple Computer\MobileSync\Backup

If there still backup you can restore factory setting and when it completes itune will ask you if you want to set up as new device or want to backup your device, So chose a backup.

But if there no backups file, apparently You can do nothing to get this apps.
But if you have purchased Apps with your Itunes id You can Any time download this apps for free. From iTunes to do this just go to top right corner of itune and select download purchased item.

Hope this will help.