Windows 7: restored laptop to factory settings cant open downloaded files

Hi everyone,

Im having a total nightmare with my laptop, Ive had it for about a year and for some reason whenever I tried to download files/applications it would come up "curupt file", after a very long time trying to look for answers, i decided to save all my files and I used system restore and wiped everything off my laptop and restored the laptop to "factory settings".
After doing this I tried to download firefox and then "invalid digital signature" poped up underneath the download, so i ran the file anyway and "curupt file" appeared.
I tried downloading google chrome and the same thing happend, its happens to everything now that i try and download.

I could really do with some help on this as no one seems what I can do, also I was toled to try and download mulwarebytes, but everytime i try and download it the same things happens.

i hope someone can help me.

I would run a disk diagnostic. If you can't download a diagnostic program see if you can find one on a bootable CD that you can get somebody to burn for you. The diagnostic program will vary depending who made your hard drive. First thing to rule out is if the HD if going bad.

Russel, I can understand your frustration, but at the same time, you have provided too little technical information in order for us to help you. Please fill in your system specs, and let us know about the software that you have installed: what kind of factory installed tools are there, what's the antivirus/security software, etc.

Disk diagnostic is a first step, a virus scan is the next, system integrity check after that. These are necessary steps, but it could be that these are not your problems, but then we need to know more about your system to find out what is.

how do you do this

There are several all purpose boot CDs out there with virus scanners, disk tools, already on them.

Ultimate Boot CD - Overview

Free Antivirus Rescue CDs and DVDs (thefreecountry.com)

compaq presario CQ61 Notebook Pc
Microprocessors Itel (r) CPU 900 @2.20GHz
System memory 2 GB

Slots 1 1GB sodimm ddr-2 667 MHz Micron
2 1GB sodimm ddr-2 667 Micron

Graphics devices (s) Mobile Intel(r) 4 series Express Vhipset Family
Current Resolution 1366x768
Refresh rate 60
System Board 3069 21.14
System Bios F.23
Hard Drive(s) TOSHIBA MK2556GSY ATA Device (232.88 GB)
Optical drives(s) hp DVDRAM GT30L
Network interface(s) T-Mobile UK
Artheros AR9285 802.11b/g/n WiFi Adaptor
Realtek PCIe FE Family Controller
Keyboards IBM enhanced (101- or 102-key) keyboard
Pointing device(s) Synaptics PS/2 Port TouchPad
USB Input Device

milesahead - i went on the ultimate boot website and downloaded it, but a box with "publisher unknown" came up and wouldnt let me open it as "file curupt" flashed up and wouldnt let me open it

unifex - here are the details i think you need about my pc,
compaq presario CQ61 Notebook Pc
Microprocessors Itel (r) CPU 900 @2.20GHz
System memory 2 GB

Slots 1 1GB sodimm ddr-2 667 MHz Micron
2 1GB sodimm ddr-2 667 Micron

Graphics devices (s) Mobile Intel(r) 4 series Express Vhipset Family
Current Resolution 1366x768
Refresh rate 60
System Board 3069 21.14
System Bios F.23
Hard Drive(s) TOSHIBA MK2556GSY ATA Device (232.88 GB)
Optical drives(s) hp DVDRAM GT30L
Network interface(s) T-Mobile UK
Artheros AR9285 802.11b/g/n WiFi Adaptor
Realtek PCIe FE Family Controller
Keyboards IBM enhanced (101- or 102-key) keyboard
Pointing device(s) Synaptics PS/2 Port TouchPad
USB Input Device

Download and burn the ISO from a different PC

PS. are you sure you did a clean install? you didnt just do a system restore? there is a major difference, if its not hardware related, the Clean install would have fixed the problem 97% of the time. If you just did a system restore, or a compaq restore from a restore point, the problem will still exist

It was a clean restore, the computer lost all my files (some of which i copied onto disk), Im not very computer savey but what is a ISO, I do have another computer I could download it on