i think u r again hit by some script....
r u able to open orkut,youtube in IE ??
goto run type 'cmd'
in the command prompt type
c:\>ATTRIB -A -R -S -H HEAP41A
now exit cmd prompt and goto c:
there u will find a folder heap41a try to delete it
all the files except svhost.exe will be deleted.
now,
goto run and type 'regedit.exe'
goto the location
HKEY_LOCAL_MACHINE,SOFTWARE\Microsoft\Windows\
CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
look for DWORD checkedvalue and change its value to 1.
restart ur PC , the problem will be solved
u will now be able to delete the folder heap41a compleatly and also able to see hidden files....
bye