I had an issue today with one of my servers where logging in took a very long time. It's mainly used as a file server / active directory server, but also runs a nightly backup and virus scan. The server is about 4 or 5 years old, and is starting to get slightly full. The C drive has about 861MB of free space (out of a max of 12 GB), whereas the D drive (where the shared drives exist), has about 40 GB of free space (out of about 120GB).
Our nightly backup (managed by Symantec backup exec) did not run last night, so I am assuming the "slow down" was occurring last night as well (the backup has a 30 minute window to start, and if that is missed it will not run). When I accessed the server this morning, the login screen displayed a few error messages stating that the "SBEAgent" (or similar) had a run-time error. "SBEAgent" is the VIPRE virus scan process. The actual login process took about 30 minutes before the server became responsive. I also received a pop-up message from the APC battery backup utility notifying me that the battery was old, and that we should consider upgrading.
I did have a (hopefully) unrelated issue yesterday where a user had a virus on their system. The virus was called "Data Restore", and also included "TDSS" (aka TDL3 / TDL4 / Rootkit.MBR.Sst.a). I was able to successfully remove all traces of the virus, but I am including this as it may pertain to my server issue.
Any help in this matter would be greatly appreciated.