Symptoms
The most obvious sign of infection are the pop ups. Vundo will cause the infected web browser to pop up advertisements; many of which claim a need for software to fix system "deterioration".
Infected DLLs (with randomized names) will be present in the Windows/System32 folder and references to the DLLs will be found in the user's start up (viewable in MSConfig), registry, and as browser add ons in Internet Explorer.
Depending on the version of the virus the following symptoms may or may not be present:
Vundo may attempt to prevent the user from removing it or otherwise impede its operation, such as by disabling the task manager or Windows registry editor. Another symptom of Vundo may be the desktop icons will disappear and so will the taskbar and reappear after a short period. This becomes very frustrating if you are trying to run programs as they get automatically aborted.
Web access may also be negatively affected. Vundo may cause many websites to be unaccessible; these websites will just hang(related:"hi5.com, "www.google.com","gmail.com")
The hard drive may start to be constantly accessed by the winlogon process
