What happened to my desktop?

I just turned on my desttop and everything is different!
noone has changed anytthing -_-
what happend?!
Its looks like an old version of windows but I have
windows vista
also it took a little longer than usual to start up -___-
how do I change it?

those kinds of prob use to happen sometime. but it might be a bugg of graphic card. because when I wanna play my pc games too... I have to configure it. so just close everything and right click. on desktop(when everything is closed or minimized) and go to properties... you vistalize again your win vista. and about of taking long I ain't too many ideals. wether you can rescan it. or you can use a soft called trojanremover(just download it).

Could be a virus or something, the same thing happened to me last year, the desktop image just disappeared and some other things were wrong too.

If it is a virus then you will probably have to re-format your computer as it will have attached itself to a system file within windows and if a virus scan removes or quarantines the file then your computer will probably stop working.

 
I'm not familiar with Vista, but maybe you can go to a Restore Point preceeding the date when everything got screwed up.