[R] problem with help.search

[Elizabeth Purdom]

Hi,
I have done something (added an unstable package, probably) that has 
made my help.search function not work. I was wondering if anyone could 
give me trouble-shooting advice to locate the problem so I don't need to 
reinstall everything from scratch.

I'm in Windows XP, R-2.6.0. The error code is below.

Thanks,
Elizabeth

 > help.search("latex")
Error in help.search("latex") : could not find package 'file153c12db'
 > traceback()
2: stop(gettextf("could not find package '%s'", p), domain = NA)
1: help.search("latex")