hello,
i used windows home premium 64bit, when i change my desktop background, after few minutes, it'll return to the previous desktop background. can anyone help me?
If the problem still isn't fixed, your computer may have damaged or corrupt system files. Sometimes files get damaged because of malware so run a full scan using your preferred anti-virus suite. Since no anti-virus is 100% effective 100% of the time, it's always a good idea to run some additional on-demand scans. These are free and recommended. The more scans you run (one at a time!) the greater the probability your computer is not infected.
If your computer comes back clean I'd next run a system file checker scan from an elevated command prompt (option two.) If problems are found, run the scan 3 times and reboot your computer after each scan.