This may be due to some reasons beyond Qatar Airways control such as internet connection or cookies in your PC's temporary files.
You will need to:

1. Clear your internet browsing history
2. Clear your internet cache
3. Delete your internet cookies
4. Delete your temporary internet folder files.

Click here for easy instruction on deleting cookies.

If the above will not work, we suggest that you use a different browser (Mozilla or Google chrome) or restart your system to continue accessing qatarairways.com.