open with error encountered

After install some software in my pc , when i m going to open a file with another format. It shows error messagebox "process refused."
when i checked it in the google. i found the way to fix it. shows as follow:

just create a txt file. and input the context as below into it, then save it as reg file. (*.reg)
then double click it, it will regedit the value into your regedit file.

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Unknown]
"AlwaysShowExt"=""
"QueryClassStore"=""

[HKEY_CLASSES_ROOT\Unknown\shell]
@="openas"

[HKEY_CLASSES_ROOT\Unknown\shell\openas]

[HKEY_CLASSES_ROOT\Unknown\shell\openas\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\
6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,25,00,53,\
00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,73,00,\
79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,68,00,65,00,6c,00,6c,\
00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,4f,00,70,00,65,00,6e,00,41,00,\
73,00,5f,00,52,00,75,00,6e,00,44,00,4c,00,4c,00,20,00,25,00,31,00,00,00

Then the problem will be solved. Good luck, if you also encountered this problem.Just follow the steps.

Windows cannot find the my net work place

After windows xp sp2 updated the PC can not find mynetwork place. It can Ping the PCs in the same network, but can not access the share folder by IP or PC name.
It said that the PC name was defined in Netboios. And we tried to reinstall the TCP/IP protocol
and Net shared printer & folder protocol . But it not work , then we tried to restart the service component in the machine management tools.
"computer browser"and "workstation" it shows 2250 error: "Workstation服务因2250服务性错误而停止;无法加载RDR设备驱动程序，无法加载Rdbss设备驱动程序;" --- that means that "the workstation service was stopped because the 2250 error , and can not load the RDR device drivers,and can not load the Rdbss device driver programme" that means the problem was cozed by RDBSS.SYS and MRXSMB.SYS
file. the system path is C:\windows\system32\drivers
after copied these two files from the same version of the windows XP into the problem pc , it worked.
and we restart the workstation service.
Finnally we solve the problem that the PC can not find My network place fault.