I have this problem that I can download software that I buy, but then when I try to open it on my computer I get the internet explorer window open and jump until I need to shut off the computer and restart it again. The same it happen to me with images unless if it's jpg, then it's fine.

Can anyone here help me?

take the backup of your files & reinstall the windows.

perhaps.
at least do that backup thingy.
try malwarebytes first, if the pc will let you...

and when done reloading,
avoid: limewire, gambling sites, internet games, coupons, porn, and opening email

google "mvp host file" and use it
avira, avast, avg, download and use one

put a hardware firewall between u and the internet
(most cheap home-use routers have one, look on the box or search newegg)

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