You will probably need professional help. If your system is infected, I would think that you should reinstall your system and transfer old data very carefully.

You can try to boot with a live Linux system to see if your screen is damaged, there are a couple of this around. They work without installation, so you won't loose your data. Still I would suggest you get professional help. Without access to your computer, Also, Windows 7 is outdated and should no longer be used.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

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