I have Lenovo Thinkpad E450 windows 7 64 bit and R7 M260 graphics card.
It kept on showing "No AMD graphics driver is installed or ..." error.
What I have tried till now.
1) Clean installation from the AMD autodetect.
2) Installed driver from the lenovo driver site.
3) windows update before installation and then install clean AMD driver installation.
4) Clean AMD driver installtion and Windows update.
None of them worked for me.
Please help me.