I presume you mean CorelDRAW Graphics Suite X6 and NOT technical Suite?
If nothing seems to work I would then do as follows.
1.Uninstall CorelDRAW X6 via Control Panel
2.After uninstalling X6 in the Control Panel - Go BACK to the Control Panel and uninstall "Corel Graphics - Windows Shell Extension".
3.Then go to Documents > Corel folder > Uninstall/Delete anything that says CorelDRAW X6
4.You can also go to C: > Program > Corel and delete anythign that says CorelDRAW X6
5.Repeat step 4, but choose folder called Programx86, and delete anything that says CorelDRAW X6
6.You should now have uninstalled everything that useally could disturb when you re-install from scratch.
7.NOW put in your DVD again with CorelDRAW Graphics Suite X6 - and INSTALL from Scratch.
8.You SHOULD now be able to run your CorelDRAW X6.
9.And NOW you should go online to www.corel.com
and download and install Update/service pack and Hotfix for CorelADRAW Graphics Suite X6
10.It should in all normal situations work just fine on your PC with any Windows 7 version as well as any Windows 8 and 8.1 version.
11.Try to use a program to recover and view CDR files. For example, you can try this CDR Open File Tool http://www.cdr.openfiletool.com/
12.Also recommend to come to this forum. Many have useful information on the topic. http://www.filerepairforum.com/forum/cad-tools/cad-tools-aa/coreldraw/479-problems-with-cdr-files
Good luck and hope this helps!