First, verify that the time, date/year & time-zone are set correctly
Clear up your Temp File/Cache. Clean up the system (clearing out all the temp/tmp folders, and included all offline content, clearing the browser tif, delete cookies.
<<http://winhelp2002.mvps.org/delcache.htm>>
(Important: One of the normal steps in eliminating malicious programs is to entirely delete the contents of all Temp folders.
Click Start > All Programs > Accessories > System Tools >Disk Cleanup
Best and easier to use - CCleaner.
Download the basic (slim) build via
<<http://www.ccleaner.com/download/builds.aspx>>
The basic (slim) build does not contain the disgusted Toolbar
DO NOT USE ANY Advanced cleaning options. DO NOT TOUCH THE REGISTRY. At least not for now.
Reboot.
It seems possible that your Windows installation has been delibeяately damaged by a trojan.
(SDBot and ZLOB, all protected by a rootkit.)) so as to prevent you updating your system or rəmoving the trojan.
Mosty likely, the computer may be infected with ROOTKITS.
Try to run TDSSKILLER to find any malware belonging to the family Rootkit.Win32.TDSS.
Download and run from here <http://support.kaspersky.com/downloads/utils/tdsskiller.exe>
Besides using an anti-virus, also scan for Malware/spyware:
A very good antimalware app are SUPERAntiSpyware (SAS) and MalwareBytes Anti-Malware (MBAM) .
The recommendation is to use the intelligent quick scan routinely, and do full scans either on a longer periodicity--weekly, monthly--or only when something is found or you have some rəason for suspicion
Run a Quick scan
MalwareBytes Anti-Malware (MBAM)
<http://www.malwarebytes.org/products/malwarebytes_free>
SUPERAntiSpyware (SAS)
<<http://superantispyware.com/superantispywarefreevspro.html>>
Please let us know if this did or didn't help to resolve your problem.
UTC/GMT is 13:04 on Saturday, July 07, 2012