Hi,
Your system is infected with a trojan and adware.
You may wish to copy and paste these instructions on notepad for easier reference later.
Boot into safe mode under your normal user name. See how
HERE
Next turn on "Show all files and folders, including hidden and system". See how
HERE
Go to start > run and type services.msc. Press the enter key.
Search for the following services(if there) double click to select stop if they are running. Set the startup type to disabled. Click apply/ok for each service you disable.
rpcc.dll
ContentTool.dll
Open your task manager by pressing holding ctrl, alt and pressing del. Alternatively, use ctrl + shift + esc. Go to the processes tab, and end the following processes, if found:
rpcc.dll
ContentTool.dll
Go to Start > Control Panel > Add or Remove Programs. Remove Megaupload Toolbar if found.
Run HijackThis and fix the following entries, if found (do this by placing a tick in the check boxes beside these entries and clicking "Fix checked":
O2 - BHO: Megaupload Toolbar - {4E7BD74F-2B8D-469E-CCB0-B130EEDBE97C} - C:\PROGRA~1\MEGAUP~1\MEGAUP~1.DLL
O2 - BHO: ohb - {5ED7D3DE-6DBE-4516-8712-01B1B64B7057} - C:\WINDOWS\system32\UpMedia\ContentTool.dll
O3 - Toolbar: Megaupload Toolbar - {4E7BD74F-2B8D-469E-CCB0-B130EEDBE97C} - C:\PROGRA~1\MEGAUP~1\MEGAUP~1.DLL
O20 - Winlogon Notify: rpcc - C:\WINDOWS\system32\rpcc.dll
Close HJT.
Navigate in Windows Explorer and delete the following files and folders in bold.
C:\WINDOWS\system32\
UpMedia\
C:\WINDOWS\system32\
rpcc.dll
C:\Program Files\
Megaupload Toolbar\
Reboot into normal mode and rehide your protected OS files.
Thereafter, please post a fresh HJT and AVG Antispyware log from normal mode as an attachment into this thread.