What is your OS ?
Please don't post active links to suspect sites. You should modify your post and edit the link so that it isn't active, this avoids accidental exposure, e.g. http :// thecoolpics.com/
Though a scan of that page by DrWeb link che3cker doesn't find anything at that page, it is just good practice not to post live links to suspect sites.
The page however redirects to a different page where infection is found, http :// horse.he.net/~dynasty/albums/style/index.php and DrWeb link checker also finds infection at the redirected page.
This was detected by the avast web shield and the only option given was Abort Connection (see image), so the infection shouldn't have been downloaded to your system, so avast won't find anything.
The Task Manager not opening I don't think is related to this alert but may be an indication of another undetected infection on your system.
If you haven't already got this software (freeware), download, install, update and run it, preferably in safe mode.
1. If using winXP
AVG anti-spyware (formerly Ewido) Resident scanner during trial On-Demand after trial ends. Or
SUPERantispyware On-Demand only in free version. Or
Spyware Terminator Resident scanner. Or
a-Squared free On-Demand only with free version(if using win98/ME).