netbook gateway can not boot

I have netbook gateway procc intel atom, window starter. 2 days ago, i browsed internet then i restart computer. i did something wrong when i click on window with startup repair (not to click start window normally). now my netbook stuck on blue screen. When i opened command prompt it says x:window\system32>.. my drive c was gone. Anyone can help it will be appreciated. sorry for my english. Thank you.

Check your ram.
Memory Diagnostics Tool
Memtest86+ - Advanced Memory Diagnostic Tool

Check your HD.
1) Boot DVD, & Press Shift+F10 (for command prompt)
2) Boot DVD, & Command Prompt at Startup (for command prompt)
Open an command prompt.
In the command prompt, type chkdsk C: f/x/r/v and press Enter.

Disk Check
Check Disk - chkdsk - Vista Forums
SFC /SCANNOW Command - System File Checker
Check Disk (chkdsk) - Read Event Viewer Log

Check the hard drive with the manufacturer's diagnostic tools.
Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.
HD Diagnostic

thank, Theog.
i followed your instruction (chkdsk: f/x/r/r) but i didn't work. still says x:....... now i use Killdisk to erase all my data. did i do right. and i stiil don't know for next steps after that...
Thank You for any suggestions....

A clean install is always a good idea.
SSD / HDD : Optimize for Windows Reinstallation

Take a look at these posts:

Common Installation Problems and Their Solutions
Questions to use for help with Installation Issues
Tutorial quick reference list for Installing Windows 7
Questions to use for help with Installation Issues
Clean Install with a Upgrade Windows 7 Version
Clean Install Windows 7
USB Windows 7 Installation Key Drive - Create

If you need more help,can you post your specs
Filling out System Specs
.

You are welcome.