I recently got a new computer (windows 7) and I can't run any updates on any of my newly installed games. I downloaded the installer from my "games" page on battle net.

Starcraft 1.15.2
Battle.net was unable to validate your game version, you require reinstall or have a virus (just too much to type here)

Diablo LOD 1.12
Battle.net was unable to properly identity your game version.

warcraft III 1.21b
an error was made while trying to write to your hardrive, you do not have enough free space.

Did i do something wrong when I installed these games?

Hello Curioustauren

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Q u o t e:
Run them in Administrative Mode.

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to expand on Sixen's comments.

there are tow ways to do this.

Temporary way: Right click the exe and choose run as administrator.

Permanent way: right click on exe choose properties click compatibility tab on upper right than check the box labeled always run as administrator.