Brushes problem and bugs (Photoshop CS)

[Anocas Lucia]

Hello! I'm new to the site so please sorry if something isn't well explained but I'm currently on a college deadline and a problem has come up.
Everything was working alright untIl yesterday where all of a sudden my works weren't in RGB format, It gave me the pop-up that the RGB file was missing on those drawings and ALL my brushes lost their texture. When I say all, it is really ALL. I've tried to re-Instal the program, the brushes, and even my windows and nothing... For example, I had some charcoal brushes Installed and now all of them behave like a default brush when I try to use It wIth my eraser, and when I try to use It wIth my brush, this just looks lIke wIndows "paint"... What Is Going on? Thanks In advance.
(The program Is In Portuguese, I'm sorry)

[Jeff Arola]

With the Brush Tool selected make sure the Mode is set to Normal and not Dissolve.

[Anocas Lucia]

Thank you! That did solve the "grainy" Issue, but sadly the missing textures are still a problem... I haven't been able to use the program since that day, I've tried all I could find and still nothing has worked. My last hope is trying to use Photoshop In another computer I guess...
(Forgot to mention, I use photoshop cs5, and I'm sorry for all the random "i"s, my keyboard isn't functioning well and with all this virus outbreak the shops' arent open for me to fix it... sorry, once again, if it's annoying.)