Several things to check here:

• If the clients  are Windows 95 ensure that DCOM is installed

• If the clients are Windows 9x ensure the CONFIG.SYS has at least 2048 bytes of DOS Environment space reserved in a SHELL= statement (i.e. 'SHELL=c:\command.com /e:2048 /p')

• Exclude the 'C:\WINNT\MS' directory from being scanned by any anti-virus programs. Remember that the Client logs are going to be updating and each time they are written to the virus scanner will kick in. For Norton Anti-virus Select 'Tools | Options | Exclusions' and add 'C:\WINNT\MS' as an excluded directory tree.

• If the clients  are Windows 9x and have the SP2 client installed check out the Windows 95 clients hang after upgrade to SP2 article for further information.