Vista - everything keeps crashing

i think ive got a virus but not sure

msn keeps crashing when i click sign in
internet explorer wont open so now im using chrome
and now avg anti-virus isnt working properly, residet shield wont run and email scanner wont run and it wont scan my pc either,
could it be virus from a email as i get tonnes of spam but i always delete them.

any help appreciated??

Hi mikey999,
You need to provide more details about the problems that you currently have.[ We are not mind readers.]
Apart from AVG what other security progs are you running?[ Defender, Win. Firewall etc]
Are the programs all fully updated? [ including Windows.]
Did another Anti Virus program come pre installed on your computer? If so how did you remove it?
How often do you run scans with AVG?
etc. etc.

Initially I suggest you download the MS Windows® Malicious Software Removal Tool & run it.
Download details: Windows Malicious Software Removal Tool

Hello mikey999,

It could be a virus, download and run these programs,

1. Malwarebytes.

Malwarebytes.org

2. CCleaner. (backup registry when prompted).

CCleaner - Home

Follow these tutorials.

System Files - SFC Command

Repair Install For Vista

This will ensure that there is no programs on your PC that should not be there, and will also ensure that your file system is clean and not corrupt in anyway.
If the problem is still there after this then at least we know the system is clean and can go from there.
As JMH mentioned, the more information you can give us the better.
Hope this helps, give it a go and post your results, good luck.

it came with mcafee originally but when it ran out i uninstalled it via add/remove programs or whatever its called on vista

then i installed avg free as a dell techinician suggested it.
it usually scans every day at 8 pm otherwise sometimes it is about every other day.
everythin is automatically updated.
i will try those things them get back to you#
but internet loads the progrm then as soon as it pops up it closes.
msn when i click sign in it doesnt respond and i have to close it.
avg. resident shield and email scanner turned themselves off and i cant get them back on and it wont let me click on the scan button, it highlights as buttons do when you go to click on them but then nothing happens any way i go to scan it..

tried JMH suggestion but it crashed at 1000 somethin files.
will try two tutorials at weekend and am running a defender scan now and cc cleaner about to start

cc cleaner succeded but nothing bad there..still doesnt work.. doing those two tutorials will i loose any files/ programs that have been installed/ or internet favorites etc?? malwarebyte will not start either...so its up to the two tutorials.. ifs theres any more info you need ask as im sure theres plenty i havent mentioned

dell inspiron 1720
1.66ghz
2 mb ram
vista sp 1 ( so cc cleaner tells me)
added bluetooth reciever myself (works fine ) no problems there.
when it was new whole motherboard was replaced under warrenty. not under warrenty anymore

avg free 8.5
newest windows live messenger (msn)
and newest version of internet explorer

mikey,

Try running the programs from Safe Mode, it may work.

mikey 999,
Re McAfee having been preinstalled on your computer. Often remnants of the program still remain after you have uninstalled it & can cause many glitches. It may be worth considering using The McAfee Removal Tool.

NOTE: Windows Vista users must right-click MCPR.exe and select Run as Administrator.
Restart your computer after receiving the message CleanUp Successful.
Your McAfee product will not be fully removed until the system is restarted.

How to uninstall or reinstall supported McAfee consumer products using the McAfee Consumer Products Removal tool (MCPR.exe)

No you wont lose any files doing those two tutorials. All they will do is verify and repair your Vista files.

ive never had problems from removing mcafee, this was a year or so ago and no problems until now?