re-installing windows = bad files?

[wupti]

Hello.

I got 2 HD, one with windows on and every "importen" files with 80GB, and one with 250GB for download, games, ect.

I re-install windows about every 3. mounth.
But often when i does, some of my files on the 250GB HD wont work, or are bad, like when i watch a movie that has always worked it would start to crash or have loop holes in the movie ect.

Anything im doing wrong or is it normal?

[MultiForce]

Never happens to me and I reinstall every 2 weeks.

Is it just movies ot does it happen to other type of files too?

[Virtualbody1234]

I think it's time to make backups and check your hard drive. Use diagnostic tools from your drive maker.

[wupti]

Is it just movies ot does it happen to other type of files too?

It happens to rar's, iso, ect. everyfile but it's not all the files, it's about 10-15 that gets like that everytime i reinstall