well, rundl32.com is not a windows file, rundll32.com is
it seems to be some type of trojan
try to find these files and delete them - ri.exe and new.exe
if you can not find them I would recommend getting and antivirus/trojan remover
here is a free one, see if this helps but should invest in an internet security suite of some kind,
a-squared Anti-Malware (a2) Download - Free Downloads of the Trial- and Freeware-Versions
Click on the free version