dondevil

i got something strange on my pc i downloaded a file .exe that appeared to be a virus which i dont know this virus do alot of things so i can't know what is it exactly
1-make iexplorer freez on random pages and in rnadom times and after closing it yet its still in the task manager so i se on my memory likr 15 iexplorer while i am on 1 only but the others are the ones been shut down

2-run like 15-->20 from 2 process rundll32.exe and scvhost.exe

3-open a pop ups fro some online scan or antivirus protection site

in the first i though that reinstaling a windows would help i am using vista btw but it didnt do anything the pc is clean in the begining but once i enter the d drive all this things reappear i cant format my pc now cause i need alot of things on it plz helpme i have tried mcafee spy sweeper spy doctor kasbersky and all those didnt work
oh i forgot all of those programs found a threwat called vumond i think or something like that and removed it i hope u can help me plzplzplz
cause i am really going mad espicaly from this iexplorer thing