sidebar.exe is a program which is probably NOT a virus. So, if sidebar.exe is on your computer, it is probably ok, and will NOT be a cause for concern. Even if your PC is virus-free, it is still recommended to purchase a good antivirus with a good detection rate, in order to yourself your PC against threats.
Usually, this application is found in C:\Program Files\Windows Sidebar\sidebar.exe.
The MD5 fingerprint for this executable is 9b0b4462bfc3afc40040780d6326ab8a.
This application is NOT registered as a Windows service. This is good.
This is a x64 executable. It uses the full capacity of modern computer processors.
The description extracted from the exe is Windows Desktop Gadgets.
File version stored as a property 6.2.8400.0 (winmain_win8rc.120518-1423).
Company Microsoft Corporation.
Copyright notice © Microsoft Corporation. All rights reserved..
sidebar.exe appears to have visible windows. This is good because it doesn't operate in a kind of stealth mode. Its operation is clearly displayed to you.
A digital certificate is missing from this program. The maker did not bother to sign it. This is usually bad.
This program does NOT have a removal routine set up in registry.