Every time I turn on my computer, an error says that it cannot start the file C:\PROGRA~1\MYWEBS~1\BAR\3.BIN\MWSBAR.DLL
What does this mean and how can I fix it?

Welcome to D-A-L.

MyWebSearch is adware/malware. Go to Control Panel, Add/Remove Programs. Look for an entry for My Web Search Toolbar. If found, remove/uninstall the program.

Also run Cool Web Shredder. I'll attach it.

Just extract and run it. No installation is necessary. Just close any open browsers, click on it (CWShredder.exe), click "I Agree", then click Fix->. If it finds anything it will eradicate it.

If neither of these measures help, I recommend you post a HijackThis log for review by our security experts.

Follow the instructions here-> HiJackThis prerequisites. There are important measures outlined here which affect and "optimize" the outcome of your HJT log.

Then post your log in a new thread in the Spyware, Adware, Viruses and HijackThis Logs Forum.

(Not in this section please).