Sometimes the Icons are just really small and so when they are displayed they don't contain enough information to display correctly but these are system icons right? Unless you did something that would affect them like the post above asks about I don't see why those would be pixelated.
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Please click the link below for your operating system to download the TSG SysInfo Utility. Click on "Save File" then double-click the file to run it. Copy and paste the report in your initial post. Windows 7 and later (downloads a file named tsginfo.exe) | Windows XP (downloads a file named SysInfo.exe)
