After seeing postings here about anti virus problems and User Account Control in Vista conflicting with this version this is what I had to do for updates and the latest version to work without problems.
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Disable Web Shield Component in AVG Anti Virus.
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Disable Resident Shield Component in AVG Anti Virus.
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Disable User Account Control at Control Panel User Accounts in Vista.
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Restart System.
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Update Internet Security to latest version.
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Restart System when asked.
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Enable AVG Components and User Account Control again.
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Restart System when asked. CIS now runs fine.
Bit long and complicated but solves the problems with updates and other programs running. Spybot, Tea Timer, AdAware, BOClean, Safe Surf, I Vault, Launch Pad, Secunia PSI, & Windows Defender plus all apps now run fine.
System Specs
System Type x64-based PC
Processor AMD Athlon™ 64 X2 Dual Core Processor 5200+, 2829 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. P1.00, 1/02/2008
SMBIOS Version 2.5
OS Name Microsoft® Windows Vista™ Home Premium
Version 6.0.6001 Service Pack 1 Build 6001
Installed Physical Memory (RAM) 4.00 GB
Total Physical Memory 4.00 GB
Available Physical Memory 2.09 GB
Total Virtual Memory 8.21 GB
Available Virtual Memory 6.01 GB
Page File Space 4.29 GB
AVG Anti Virus Version 8.0.237
All the best people, hope this helps you get this sorted out 
:-TU