Can you please do the following.
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Can you disable Windows Defender as it may interfere with the removal process. Please leave it disabled until your PC has been given the all clear.Open Windows Defender
Click Tools
Click General Settings
Scroll down to Real Time Protection Options
Uncheck Turn on Real Time Protection (recommended)
After you uncheck this, click on the Save button
Close Windows Defender
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Download the Adware.Istbar removal utility from Symantec and following the instructions on the same page.
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Go to Add/Remove programs and uninstall the following, if present:
MyWebSearch
The above could appear anywhere within the entry. Be careful not to remove any personal or system software.
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Run HiJackThis then:
1. Click "Open the Misc Tools Section"
2. Click "Open Process manager"
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Next, while holding down the CTRL key, locate (if present) and click on (highlight) each of the following:
C:\WINDOWS\ysavv.exe
Now double-check and make sure that only those item(s) above are highlighted, then click "Kill process". Now, click "Refresh", check again, and repeat this step if any remain.
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Scan with HijackThis and then place a check next to all the following, if present:
R1 - HKCU\Software\Microsoft\Internet Connection Wizard,ShellNext = http://www.dell4me.com/mywaybiz
O3 - Toolbar: (no name) - {07B18EA9-A523-4961-B6BB-170DE4475CCA} - (no file)
O4 - HKLM\..\Run: [¢‰¸K0¨4W
O4 - HKLM\..\Run: [¢‰¸K0¨4W
O4 - HKLM\..\Run: [¢‰¸K0Ô@ÔÁß]§ú"ü‰üžiC:\Program Files\ISTsvc\istsvc.exe] C:\WINDOWS\ysavv.exe
O4 - HKLM\..\Run: [¢‰¸K0ÔÁß]§ú"ü‰üžigÝC:\Program Files\ISTsvc\istsvc.exe] C:\WINDOWS\ysavv.exe
O4 - HKCU\..\Run: [WinFixer2006] "C:\Program Files\WinFixer_2006\uwfx6.exe" /min
O8 - Extra context menu item: &Search - http://bar.mywebsearch.com/menusearc...S_ZCxdm492YYUS
O21 - SSODL: bestreak - {874443fe-aa33-4ebf-a6ac-73208787e62d} - (no file)
Now, close all instances of Internet Explorer and any other windows you have open except HiJackThis, click "Fix checked".
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Locate and delete the following item(s), if present. Make sure you are able to view system and hidden files/ folders:
folders...
C:\Program Files\WinFixer_2006
files...
C:\WINDOWS\ysavv.exe
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Note that some of these file(s)/folder(s) may or may not be present. If present, and cannot be deleted because they're 'in use', try deleting them in Safe Mode by doing the following: Restart your computer
After hearing your computer beep once during startup, but before the Windows icon appears, press F8.
Instead of Windows loading as normal, a menu should appear.
Select the first option to run Windows in Safe Mode hit enter.
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Reboot.
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After rebooting, rescan with hijackthis and post back a new log. Please let me know how your pc is now.