Run Hijackthis and select "Do a system scan only", place a check by the following entries.
R1 - HKCU\Software\Microsoft\Internet Explorer\SearchURL,(Default) = http://red.clientapps.yahoo.com/cust.../www.yahoo.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page = C:\WINDOWS\about.htm
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Local Page = C:\WINDOWS\about.htm
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
R3 - Default URLSearchHook is missing
O2 - BHO: bitlocker - {01EB5130-FC0C-4d75-B9CE-4801B1B854F5} - C:\WINDOWS\system32\nsbE.dll
O2 - BHO: SafeGuard Protect PCShield - {564FFB73-9EEF-4969-92FA-5FC4A92E2C2A} - C:\WINDOWS\System32\sfg_3904.dll
O2 - BHO: Related Page - {9A9C9B69-F908-4AAB-8D0C-10EA8997F37E} - C:\WINDOWS\system32\WinNB57.dll
O3 - Toolbar: (no name) - {a19ef336-01d4-48e6-926a-fe7e1c747aed} - (no file)
O3 - Toolbar: Related Page - {9A9C9B68-F908-4AAB-8D0C-10EA8997F37E} - C:\WINDOWS\system32\WinNB57.dll
O4 - HKLM\..\Run: [{3C-C6-61-19-ZN}] C:\windows\system32\dwdsregt.exe FI002
O15 - Trusted Zone: http://click.getmirar.com (HKLM)
O15 - Trusted Zone: http://click.mirarsearch.com (HKLM)
O15 - Trusted Zone: http://redirect.mirarsearch.com (HKLM)
O15 - Trusted Zone: http://awbeta.net-nucleus.com (HKLM)
O16 - DPF: {42F2C9BA-614F-47C0-B3E3-ECFD34EED658} - http://promo.dollarrevenue.com/webma...rtload197a.exe
Close all open windows and browsers, and hit "Fix Checked".
Delete this file.
C:\windows\system32\
dwdsregt.exe
Reboot and post a new log, and say how things are now.