A
4.) If its not a virus problem and someone disabled Registry Editor in ur system, then u can enable it again by following any of following methods:
a.) Type gpedit.msc in RUN dialog box and goto:
User Configuration -> Administrative Templates -> System
in right-side pane, set "Prevent access to Registry editing tools" to either Not Configured or Disabled.
b.) Just type following in RUN dialog box and press <ENTER>:
Now after enabling Registry Editor, u can enable Folder Options again by using 1st or 2nd step 
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hey vishal tried this way u told and also using antivirus...nothing worked..i am using xp home with service pack 2 so i dont think group editing will work...pls help me man...its urgent...
a.) Type gpedit.msc in RUN dialog box and goto:
User Configuration -> Administrative Templates -> System
in right-side pane, set "Prevent access to Registry editing tools" to either Not Configured or Disabled.
b.) Just type following in RUN dialog box and press <ENTER>:
Code:
REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f
