Installation of LR 6 from DVD on Windows 7 works fine, but after rebooting my computer, I can't use LR anymore. Same thing happens with Adobe Flash Player. Guess it's my computer's problem - but how can I solve it? This issue only appears with Adobe products.
Can you be more specific about what you mean when you say "I can't use LR anymore?" Is there any sort of error that appears when you attempt to start Lightroom? Do you see the splash screen, or doesn't it get that far?