Slow scrolling on the network.

What OS?

First of all try the System File Checker:
  Click Start
  Click Run
  In the Open box that appears, type->
  SFC /PurgeCache <ENTER>
  SFC /ScanNow <ENTER>
  You may need your installation source (CD) as this process will replace corrupted drivers on your system.

If you're running XP/2K, use the above, otherwise for 98 - just SFC without the parameter

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Try removing items from Startup:
  Click Start
  Click Run
  In the Open box that appears, type->
  MSCONFIG <ENTER>
  In the Startup tab, start out by disabling everything you're unfamiliar with (or everything if you're
  unsure).
  Optionally, you can also disable non-Microsoft services from the Services tab.
  If the problem no longer exists after a reboot, then you can narrow it down as one of the items in your
  startup.  To permanently remove these item(s), proceed as follows...

  Click Start
  Click Run
  In the Open box that appears, type->
  REGEDIT <ENTER>
  *Be careful when editing the registry as an accidental deletion can render your system inoperable.
  First navigate to the following key in the registry:
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  Once found, click File, Export to save a copy of the key before you delete any items (if necessary).
  After the file has been saved, delete items as needed from the right pane.
  Now find the next startup key:
   HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  Follow the previous procedures to export a copy before deleting items from the right pane.

Remove temp files from the system:
  Click Start
  Click Run
  In the Open box that appears, type->
  %TEMP% <ENTER>
  This is your profile's temporary folder location.  All files can be deleted here, but not the containing
  folder.  Some files may be in use, so an error may be generated but can be ignored.
  System temp folder can be found by Start->Run->%systemroot%\temp

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Blackviper's site is great for freeing up resources by stopping/disabling unneeded services:
For Win2k: http://www.blackviper.com/WIN2K/servicecfg.htm
For XP: http://www.blackviper.com/WinXP/servicecfg.htm

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Also, Symantec's Autoprotect service has been known to cause buggy problems with high cpu utilization.  Try stopping that service and see if the problem disappears.

Try re-registering autoprotect: (http://service1.symantec.com/SUPPORT/nav.nsf/b69c799adfa31ecc85256aa30052f4d0/f0c69fcb50e2eeaa85256b180068dbf5?OpenDocument&src=bar_sch_nam)

To unregister and then register the Auto-Protect service:
Exit all open programs.
Click Start, and then click Run. The Run dialog box appears.
Type the following and press Enter:
"C:\Program Files\Norton AntiVirus\navapsvc.exe" /unregserver
NOTE: This is the default location for NAV installed as a stand-alone product. If NAV is part of Norton SystemWorks (NSW), then substitute the program path for the NAV module of NSW.
Click Start, and then click Run. The Run dialog box appears.
Type the following, and then press Enter:
"c:\Program Files\Norton AntiVirus\navapsvc.exe" /service
NOTE: This is the default location for NAV installed as a stand-alone product. If NAV is part of Norton SystemWorks (NSW), then substitute the program path for the NAV module of NSW.
Close the Services program.
Open NAV.
Click Options, and then click Auto-Protect.
In the right screen, click "Enable Auto-Protect (Recommended)" and "Start Auto-Protect when Windows starts up," and then click OK.
Restart the computer.

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Check for Spyware:
  HijackThis -->http://www.spychecker.com/program/hijackthis.html
  Spybot-S&D -->http://www.safer-networking.org/
  Web Shredder -->http://www.spywareinfo.com/~merijn/cwschronicles.html#cwshredder
  Ad-Aware --> http://www.netsecurity.about.com/library/blfreespyware.htm

Check for Viruses with online scanners:
  Symantec --> http://security.symantec.com/sscv6/default.asp?productid=symhome&langid=ie&venid=sym
  McAfee Security --> http://us.mcafee.com/root/mfs/default.asp

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Winsock/TcpIp may be corrupted.  Try repairing with this utility (works on XP/2K): http://members.shaw.ca/techcd/WinsockXPFix.exe

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To attempt a repair of IE:
 http://support.microsoft.com/?kbid=318378
 http://www.theeldergeek.com/repair_ie6.htm
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