Did you go for "Check updates" during the installation.
There is problem with the patch for checkupdates as it keeps on working with the Asyn service which stops it working fine.
Check to see that u didnt go for updates during installtion if u have selected it.
There is a patch available at microsoft u can go for it and it needs a pwd which the support team can provide free.
Even though if it doesnt work then i guess u need to install crm once again and make sure that this time u dont select the
"Check Updtes"
Hope this will help you