Why can't my laptop's video graphic card be detected if it was working before I updated my Windows?

Question

When I bought my laptop it had already had a video graphic card. It was working and I would play a lot of games on it, but it was getting old and I wanted to update my WIndows. So when I had updated it to Windows 7 from an XP it had deleted all my games and files, which I already knew would happen, but now I can't play the games I wanted. I had already installed them but when I try playing them it says that the card can't be detected. I don't know why it's saying that if I know for a fact that I have one in there.

Answer 1

First, don't ever load anything like "driver sweeper" into your system.
Windows needs NOTHING to work properly. Avoid all free "tools" from the internet.
You are just asking for problems when you install stuff "free" from the internet.

Sign in as administrator (If you are not administrator you may be blocked)
Close all the applications that are being used...save and close your files...
Turn Off the antivirus and firewall, turn off the functions of windows defender.
For more you can refer to this site.
http://www.tomshardware.com/forum/388897-33-graphics-card-detected-installing-drivers