Help deleting spyware\virus dlls causing major problems

hey,
recently ive had a bunch ofroblems with my pc i keep getting "visual c++ runtime (buffer overrun)" errors that are killing explorer and iexplorer plus when i browse i get a bunch of pop ups for spyware and random pc checks, ive got nod32 and popupcop but the problem goes deeper then the popups there are 2 dlls in the startup in msconfig that keep appearing in different name ie: "nnnooeeu.dll" and "hggvvwww.dll" ive tried everything to delete them safe mode with command promt which is most effective dosnt work either so i download wholockme to see whats locking them and there been locked by system services one is lsass.exe and other winlogon.exe ive checked oer computers and these dll files do not exist.
my computer is lagging and boting up slow and browsing very slow.
anyone have any ideas?

Thanks in advance!
good day

 

my computer isnt slow its a couple months old and runs fine xcept for the problems i described above i tried ceaning the computer with the programs in the guide but the dlls just wont delete and they arnt detected by any of the scanners.