if still have problem upgrade from windows 7 to windows 10 please tell me..especially security issues
because a lot of customer complain when upgrade from windows 7 to windows 10, either file corrupted, few days use then windows cannot load and some use original key for windows 7 when upgrade to windows 10 the said insert original key

do comment much appreciated

Upgrading win7 to win10 isnt much of an issue only if the win7 is healthy for the upgrade, user that had adware/virus/malware, stardock, accounting software & custom software would have more issue with an upgrade than a clean install.

oww i see.. usually the problem that occurred are windows genuine and software incompatible right?

Licensing isnt much of an issue to most user, afaik even those invalid licensed copy of win7/8 during the free upgrade period could be upgraded as a qualifying license copy. so the only issue are hardware compatibility & how healthy is the previous OS before upgrade.

owww I see, thanks for the advice

make sure clean install would be the best