Is these entries virus or trojan?

[dredge]

I am now using windows 7. However, I found some process that does not appear before but it's running now when I ran Hijackthis(just to inspect). I googled it but it seems like Prevyx and some forums suggested that theses are viruses.So, are these infected processes?

The processes:
O4 - HKUS\S-1-5-19\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'LOCAL SERVICE')
O4 - HKUS\S-1-5-19\..\RunOnce: [mctadmin] D:\Windows\System32\mctadmin.exe (User 'LOCAL SERVICE')
O4 - HKUS\S-1-5-20\..\Run: [Sidebar] %ProgramFiles%\Windows Sidebar\Sidebar.exe /autoRun (User 'NETWORK SERVICE')
O4 - HKUS\S-1-5-20\..\RunOnce: [mctadmin] D:\Windows\System32\mctadmin.exe (User 'NETWORK SERVICE')

[hellnoire]

Sidebar.exe, both of them, are fine. They're your desktop sidebar\widgets, and assuming you're using Vista or 7, it's safe. (And you said you're using 7...)

The other... mctadmin.exe is a microsoft tool in Windows 7 and Windows server 2008 R2 to allow Local Pack installation for a customized Windows 7 installation for a specific region. It also handles the themes.

So they're safe.

[bivas600]

no they seemed to be harmless
prevx3.0 is good as detection wise but catches too much fp
nothing to worry dude