When it turn on my computer, it says "This app can't run on your PC" but it won't tell me which app. How do I find out?

you may have a malicious program or some sort of unwanted bloatware causing this problem. hit the windows key and the R key at the same time. in the box that pops up, type "msconfig" without the quotes. then go to the startup tab. this will list all of the programs set to open when you boot your computer. you will have to pinpoint which one isnt working. uncheck anything from the list you dont want there. if there is an item on the list that you dont recognize, google it and see if you need it or not. after clicking apply, it will tell you to restart your computer. after doing so, the problem should no longer occur.

No we don't. We use it everyday and find it great. Why do you think it sucks? What does it do you don't like? What does it not do that you want it to?

It is the app you clicked on? Which computer? Just look in the Start Up folder in Widows Explorer.