I have some huge log files, which are taking up all the space on a PC's hard drive. Is ok to simply delete the log file: C:\Program Files\Microsoft SQL Server\MSQQL10_50.SQLEXPRESS\MSSQL\Log\ERRORLOG.1 ?
This article discusses configuring log rotation limits (see management studio express). According to the definition of the error log, it does not seem to be essential for your instance to run properly. I would say it is safe to delete, but you likely want to configure rotation.