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- amd radeon 7700m series
- laptop, dell ispiron 5520
- Windows 8 64bit
- Driver version installed
- trying to install crimson 15.11.1
- Amount of memory installed; e.g. 8gb
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First..the last driver for your laptop was 14.4, dated 4/24/2014.
You need to use the free updated to Windows 8.1.
If you have further questions..supply all the info asked for: