That's just weird it only affects this site. Do you use a favorites/bookmark for the site? You could try deleting the current one and tag a new one,I did that awhile ago and I think it was for this site.
When was or have you ever defragmented the registry? This is different than doing the disk and needs a program for that purpose.
I do mine at least monthly (I do a disk defrag too) to keep things fast as can be.
Here's some links for the tools I use (free versions);
http://www.glarysoft.com/http://www.winaso.com/http://www.iobit.com/en/update/asc/They all have a registry defrag tool in addition to all the other cleaning options. Like I said,I use all 3 to clean the registry with and every time one or more find something the other(s) didn't. Then I reboot.
I've come to realize keeping a computer in good running condition takes more time than a motor vehicle these days,who'd a thunk!?
If none of that works you might try this site,they're pretty helpful.
http://www.majorgeeks.com/
12 yrs.exp. in IH dealer parts dept.
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