if it is sep 11 client then you need to use sylink replacer 11 version. what is the error you receiving while replacing?

did you check the sylinkreplacer pdf.

Hi,

I think Syslink Replace tool  not working in windows 7 machine.

Check this artical some person same issue.

http://www.symantec.com/connect/downloads/sylinkreplacer-tool-connecting-sep-clients-sepm

Hi,

Could you please confirm the SEPM version?

Dear Chetan,

SEPM version is 11.

Check with the basic prerequesites to run the sylink replacer utility.

Login as a Domain admin

Ping the windows 7 machine to check conectivity issues

Check with windows firewall.

Have the latest version of replacer and sylink file and run it.

Hello,

Could provide us a brief explaination on when you say "it's not replaceing sylink.xml file on win7 machine's"?

Does it provide you an error message during replacing the sylink.xml on the client machine OR Sylinkreplacer is unable to detect the Windows 7 machines?

Check these Article:

When running the SylinkReplacer tool to replace the SyLink.xml of the SEP client the error "No SEP clients discovered" is reported

http://www.symantec.com/docs/TECH154680

What ports does SylinkReplacer for SEP use to communicate across the network?

http://www.symantec.com/docs/TECH186661

Secondly,  SEP 12.1.2 (due to release soon) has a new feature: you will be able to connect existing Windows SEP clients via Client Deployment Wizard using the Communication Update Package Deployment option. This will work for both 11.x and 12.1.x clients. In other words, the Sylink Replacer functionality will be built in to the SEPM. 

Check this Article in reference to the SEP 12.1 RU2 on this new feature:

http://www.symantec.com/docs/HOWTO81455

Hope that helps!!