Color Reverts to Default Every Startup

Ever since I reformatted my hard drive, the colors have
been messed up. The toolbar color changes and the internet
won't show background colors, font colors, and won't
display the text at it's normal size. After five minutes,
the computer seems to lock up for a second, then refresh
itself, and the colors change (not to the scheme they
should, however), but the internet is back to normal. If I
set a Windows Desktop Theme, it works, but then once I
restart the computer, it reverts. I can't figure out how
to keep the colors/scheme/theme to stay. Help.