SQL Server remote connection

I have lost the remote connections to my instance of SQL server from other PCs on our network. I get error 26. I had no issues connecting, then a new hard drive was installed on my computer. since then no remote connections to my sql instance can occur, the computer name is the same as before the drive change, SSMS and the programs using my sql server instance on my PC are functioning, its just the remote connections that have been truncated. any help is appreciated greatly