Can you please do the following.
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Let's look for, and delete, any program segments (prefetches) that might be present, and are associated with the 'problems' we're trying to remove from your PC. To do this, let's:
1) Click "Start | Search", then search for each of these program's base name(s), in all files and folders:
service.exe*
2) Then if any are found in the 'prefetch' folder, delete them.
Look closely, since the 'base' name will have a bunch of random numbers and letters attached to it.
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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\service.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:
O2 - BHO: (no name) - {7E853D72-626A-48EC-A868-BA8D5E23E045} - (no file)
O4 - HKLM\..\Run: [Windows UDP Control] winudspm.exe
O4 - HKLM\..\Run: [Windows svchost] service.exe
O4 - HKLM\..\Run: [Windows UDP Control Center] winudpmgr.exe
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:
files...
C:\WINDOWS\service.exe
Search for...
winudspm.exe
winudpmgr.exe
...using "Start | Search...".
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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.