Burner wont read videos that I burned off it

[Muder50]

I have windows xp home. last week When I got it I was able to burn DVDS on my Sony burner & then the only thing I can think of is that I applyed some windows update security & now my burner wont read my DVDS that I have backed up. it keeps saying please put dvd in drive. its already there & I think I have lost my mind cause last week it worked, They play fine on my tv DVD. I have tryed both DVD + & DVD- so thats not the problem. has anyone out there had the same problem as me?? if they have can they tell me what To do. I am really new to all this.

[setarip]

Perform a "system restore" back to the most recent date that things worked properly...

[de Witte]

I do have the same problem with some discs I use WIN98se, traxdata 2.4x DVD+R and DVDshrink nero 6.3.
some of the disc i burned work well in my DVD player but
in my DVDwriter it doesn't recognise the DVD aks DVD but as a disc of 1.99 GB and has 1 file on it an audio file.
My writer is a RICOH MP5240A.