W 10 Tech Preview installation Question

[zinc1610]

If I install W10TP build 10074 now, what will happens to my laptop? how about the existing drivers? how about my existing apps? My laptop running Windows 7 Home Premium. Thank you everyone for your kind answers.

 

[hotphil]

Depends if you do an upgrade or a clean install.
For the sake of safety, assume it wipes everything.​